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Fix a modem that drops connection

We'll check power, heat, signal, and line quality—so the modem stops dropping or we tell you when to call your ISP.

Troubleshooting · Wi‑Fi & networking
10–25 min
What you'll need
  • Modem
  • Router (if separate)
Step 1 of 5

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Steps

Goal: Check power, heat, and connections so the modem stops dropping.

  • Confirm the modem has stable power and ventilation. Overheating causes drops.
  • Power-cycle the modem and the router.
  • Check coax or phone line connections. Try a different jack if needed.
  • Good: The modem stays connected. Bad: The modem still drops—call your ISP.

Power and heat

Goal: Confirm stable power and ventilation.

  • Use a stable outlet. Ensure the modem has airflow and is not overheating.
  • Good: Power stable, modem cool. Bad: Unstable or hot—fix first.

Connection check

Goal: Confirm line connections.

  • Check coax or phone line at the modem and wall. Loose connections cause drops.
  • Good: Connections tight. Bad: Loose—tighten or try different jack.

When to get help

Call your ISP if:

  • The modem still drops connection after checking power, heat, and connections.
  • They can check signal levels and line quality.

Verification

  • The modem stays connected for extended periods.
  • No repeated sync or reconnect events.
  • Internet is stable.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Check power and heat Stable outlet, modem has ventilation.
  2. Power-cycle Restart modem and router.
  3. Check connections Firm coax or phone line, try different jack.
  4. Call ISP ISP can check signal levels.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Modem model
  • When drops occur (pattern)
  • Steps already tried

Does the modem have stable power and ventilation?

Unstable power or overheating causes drops.

Check the modem is on a stable outlet and has ventilation. Good: power stable, modem cool. Bad: unstable power or overheating—fix first.

Yes No

You can change your answer later.

Fix power and ventilation

Use a stable outlet. Move the modem to a cool, ventilated spot. Check if drops stop.

Done

Power-cycle modem and router

Unplug modem 30 seconds, then router. Plug modem in first, wait for sync, then router. Good: connection stable. Bad: still drops—check line, or call ISP.

Yes No

You can change your answer later.

Connection stable

The modem stays connected. Monitor for further drops.

Done

Check line and call ISP

Check coax or phone line connections. Try a different jack. If still drops, call your ISP to check signal levels.

Done

Reviewed by Blackbox Atlas

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