Last updated September 5, 2026
A cable modem lasts 5 to 7 years on average. A WiFi router lasts 3 to 5 years, warningand a modem router combo falls in between at roughly 4 to 6 years. Most modems are replaced before they die outright, because they start dropping the connection, fall behind the speed of your plan, or get retired by your provider. In 2026 that last reason is the big one: Xfinity, Spectrum, and Cox are all removing DOCSIS 3.0 modems from service, and Spectrum shuts them off completely on October 28, 2026.
This guide covers how long modems and routers last, why they wear out, the seven signs your modem is going bad, how to tell whether the modem or the router is the problem, and the DOCSIS 3.1 replacements we recommend.
Key Takeaways
- Cable modems last 5 to 7 years and routers last 3 to 5 years before heat wear, ended firmware support, and outdated standards catch up with them.
- Frequent disconnects, daily reboots, wired speeds far below your plan, and a DOCSIS 3.0 label are the clearest signs it is time to replace your modem.
- If your modem is DOCSIS 3.0, replace it now regardless of age. Xfinity removed DOCSIS 3.0 modems in 2026, Spectrum ends support on October 28, 2026, and a DOCSIS 3.1 modem costs less than a year of rental fees.
Modem under five years old and stuck in a reboot loop?
A failing power adapter, overheating, or a loose coax connection causes most restarts on newer modems. Work through our modem keeps restarting guide before you replace anything.
How Long Do Modems Last?
A cable modem typically lasts 5 to 7 years. A wireless router typically lasts 3 to 5 years. Modem router combos land at roughly 4 to 6 years, because the WiFi half ages out before the modem half does.
Modems rarely die all at once. They decline slowly. Capacitors and other components wear down from running hot 24 hours a day. Manufacturers stop releasing firmware updates. Your provider upgrades its network, and older hardware can no longer keep up with the speeds you pay for. That is why a modem can be technically "working" and still be the reason your internet keeps dropping.
Why Modems Wear Out
Four things shorten a modem's useful life:
- Heat. Modems run continuously and generate constant heat. A cramped cabinet, direct sunlight, or a stack of other electronics speeds up component wear.
- Power surges. Small surges from storms and grid fluctuations do cumulative damage over the years, even when they never fully kill the device. A surge protector helps.
- Ended firmware support. Once the manufacturer stops issuing updates, bugs stay unfixed and security holes stay open.
- Provider retirement. Cable companies retire old DOCSIS standards from their networks. A healthy DOCSIS 3.0 modem stops working the day your provider stops supporting it.
7 Signs Your Modem Is Going Bad
If two or more of these apply, your modem is most likely failing or obsolete.
It only supports DOCSIS 3.0
DOCSIS is the standard cable modems use to talk to your provider. DOCSIS 3.0 tops out around 600 to 700 Mbps in real use with a hard upload ceiling of 200 Mbps. DOCSIS 3.1 handles gigabit and multi-gig plans with lower latency and better security. More important in 2026, the major providers are shutting DOCSIS 3.0 off. Xfinity removed every DOCSIS 3.0 modem from its approved list in two waves this year. Spectrum ends DOCSIS 3.0 support on October 28, 2026. Cox has been pushing customers off 3.0 hardware, and with Charter's acquisition of Cox complete as of August 20, 2026, Cox markets follow Spectrum's timeline from here. Check the label on the bottom of your modem or search the model number. If it says DOCSIS 3.0, skip the rest of this list and replace it. Our Spectrum DOCSIS 3.0 retirement guide covers what to do before the cutoff.
Your internet drops several times a day
Occasional outages are normal. Losing connection every few hours, or every few minutes, is not. If your provider has checked the line and the coax connections are tight, recurring disconnects usually point to failing modem hardware. Aging components struggle to hold a stable signal lock, especially once the device warms up.
You have to reboot it constantly
Restarting your modem once in a while is normal maintenance. Unplugging it every day, or keeping a power strip within reach just for reboots, means the modem can no longer manage its own memory and connections. A reboot clears the symptom for a few hours, then the hardware problem comes back.
Wired speeds are far below your plan
Run a speed test with a laptop plugged directly into the modem with an Ethernet cable. If you consistently get less than 60 to 70 percent of your plan speed on a wired connection, and your provider confirms the line is healthy, the modem is the bottleneck. This is extremely common when someone upgrades to a faster plan and keeps hardware from 2018 or earlier.
The modem runs very hot
Warm is normal. Hot to the touch is a warning. Excess heat is both a symptom of aging components and a cause of further damage. If your modem is noticeably hotter than it used to be, or disconnects more often during heavy evening use, heat stress is breaking it down from the inside. Check the power brick too. A hot, buzzing power adapter fails before the modem does and is a cheap fix on a newer unit.
It no longer receives firmware updates
Firmware updates fix bugs and patch security holes. Most manufacturers support a modem for about 5 to 7 years, then quietly end updates. An unsupported modem is a security risk for every device in your home, since all of them connect through it. If your model has been discontinued for years, it is time to move on even if it still connects.
The lights keep cycling
Status lights that constantly blink, cycle, or drop from solid blue or green back to searching mean the modem is repeatedly losing and reacquiring its connection. If you have already worked through a troubleshooting guide and the same pattern keeps returning, the hardware itself is the most likely cause.
Modem vs. Router: Which One Is Failing?
Plug a computer directly into the modem with an Ethernet cable and run a speed test. If the wired connection is fast and stable but WiFi is slow or drops, the router is the problem. If even the wired connection drops or underperforms, the modem is the problem. With a combo unit, either half can fail, and replacing the whole device is the only fix.
Routers age faster than modems because WiFi standards move faster than DOCSIS. A router that predates WiFi 6 is at least five years old and will cap the speed and coverage of any plan you pair it with. Before replacing one, rule out the basics with our router restart guide.
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The Best Replacement Modems and Combos in 2026
Every pick is DOCSIS 3.1, which works on every current cable plan and will not need replacing when your provider finishes retiring DOCSIS 3.0. Approval varies by provider and by plan, so confirm the exact model on your provider's approved list before you buy. For picks by speed tier, see our best DOCSIS 3.1 modems roundup.
Standalone Modems (Pair With Your Own Router)
- ARRIS SURFboard SB8200: The proven workhorse for plans up to 1 Gbps, with two Gigabit ports and a long reliability record on Xfinity, Spectrum, and Cox. Not supported by Mediacom since late 2024.
- ARRIS SURFboard S33: DOCSIS 3.1 with a 2.5 Gbps port for multi-gig plans. The safe pick for Spectrum Gig. One caveat: it is not approved for Xfinity's Next Gen mid-split upload tiers. Xfinity customers on those plans should read our S33 vs S34 comparison first.
- Motorola MB8611: DOCSIS 3.1 with a 2.5 Gbps port and Active Queue Management for lower lag. A favorite in gaming households on Xfinity and Cox.
- NETGEAR CM1000: A simple DOCSIS 3.1 modem for plans up to 1 Gbps. Does one job and does it well.
Modem Router Combos (All-in-One)
- NETGEAR Nighthawk CAX30: DOCSIS 3.1 modem plus a WiFi 6 router in one box. The strongest all-around upgrade for a home replacing a rented gateway.
- ARRIS DG3450: DOCSIS 3.1 gateway with dual-band WiFi 5 and four Gigabit ports, approved for Spectrum and used by regional providers such as TDS. The lowest-cost way to replace an aging Spectrum gateway on a plan up to 1 Gbps.
Quick Comparison
| Model | Type | Max plan | Best for |
|---|---|---|---|
| ARRIS SB8200 | Type: Modem only | Max plan: 1 Gbps | Best for: Reliable gigabit on Xfinity, Spectrum, Cox |
| ARRIS S33 | Type: Modem only | Max plan: 2.5 Gbps | Best for: Multi-gig plans, Spectrum Gig |
| Motorola MB8611 | Type: Modem only | Max plan: 2.5 Gbps | Best for: Gaming and low latency |
| NETGEAR CM1000 | Type: Modem only | Max plan: 1 Gbps | Best for: Simple gigabit setups |
| NETGEAR CAX30 | Type: Combo, WiFi 6 | Max plan: 1 Gbps | Best for: All-in-one WiFi 6 upgrade |
| ARRIS DG3450 | Type: Combo, WiFi 5 | Max plan: 1 Gbps | Best for: Replacing a Spectrum gateway on a budget |
Shopping by provider instead? Browse modems verified for Xfinity, Spectrum, and Cox, or see all cable modems and modem router combos.
Should You Repair or Replace a Failing Modem?
Replace. Modems are sealed devices with no user-serviceable parts, and a tested refurbished DOCSIS 3.1 modem usually costs less than a year of gateway rental, which runs $10 to $25 per month where providers still charge it. Replacing a five-year-old modem also gets you support for faster plans, current security, and hardware your provider will not retire next year, all in one step.
Wondering whether to wait for DOCSIS 4.0? As of September 2026 there are still no retail DOCSIS 4.0 modems, and every one in service is provider-issued. A DOCSIS 3.1 modem keeps working on a DOCSIS 4.0 network, so there is no reason to hold off. Our DOCSIS 4.0 modem guide has the details.
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Frequently Asked Questions
How often should you replace your modem?
Every 5 to 7 years, or sooner if you upgrade to a plan your modem cannot support or your provider retires its DOCSIS standard. In 2026, any DOCSIS 3.0 modem should be replaced now regardless of age.
How do I know if my modem is going bad?
The most common signs are frequent disconnects, needing daily reboots, wired speeds well below your plan, unusual heat, and status lights that keep cycling. If two or more of these apply and your provider says the line is fine, the modem is failing.
Can a modem go bad?
Yes. Modems run 24 hours a day and their components wear from constant heat. Most fail gradually rather than all at once, showing up first as intermittent drops and reboots before they stop connecting entirely.
Can an old modem slow down internet speed?
Yes. An old modem is one of the most common causes of slow internet. A DOCSIS 3.0 modem caps out around 600 to 700 Mbps in practice with uploads limited to 200 Mbps, and aging hardware often delivers far less than its rated speed.
Do modems wear out if they are left on all the time?
Gradually, yes. Modems are designed to run continuously, but years of constant heat wear down internal components. Good ventilation extends their life. There is no need to turn a modem off at night.
Is it better to buy or rent a modem?
Buying is almost always cheaper. Where providers still charge gateway rental, it runs $10 to $25 per month, or $120 to $300 per year. A refurbished DOCSIS 3.1 modem pays for itself within months and lasts 5 to 7 years.
Do I need a new modem or a new router?
Test with a computer plugged directly into the modem. If wired speed matches your plan but WiFi is slow or drops, replace the router. If wired speed is also slow or unstable, replace the modem. Routers wear out sooner, at 3 to 5 years, because WiFi standards move faster than DOCSIS.
