Any ideas on what might be the problem with my router?

I recently had a router wear out. It did exactly as you are describing, if I’m reading correctly. The signal would go on and off. It was not the cable; it was the router. I bought a new one, and everything works perfectly now. The old router lasted about 5 years, by the way.

Power supply on the router.

Or a loose antenna on the wireless side of it.

Routers are cheap to replace – $25 max for a cheap one.

My cordless phone was on the same frequency as my router. Talking on the phone would interfere and break the connection. Very frustrating. I replaced the phone.

Do you have two routers on the same network? An upstairs router and a downstairs one? If so, that could be the problem. Routers don’t play nicely with each other. I couldn’t have two on mine. Had to limit it to one.

@wundayatta No, just the one.
@LuckyGuy How can you tell if they are? I don’t think this is the problem because it has worsened over time.
@elbanditoroso checked the antenna on the unit and the PCI card seems fine. Not sure on the power supply end of it. I did verify it is plugged in well but to “reboot” it I pull out the connector at the unit not at the outlet.
@Hawaii_Jake I think this may be it. It is about four years old and was not an expensive model to begin with.
Thanks to all.

@rojo The phone was labelled as operating at 2.4GHz and I ran the following experiment.
While online, I picked up the phone and dialed my cell phone. I lost my connection immediately .