Wired Internet Connection Keeps Temporarily Disconnecting

My wired Internet connection periodically disconnects for 2 or so seconds before automatically reconnecting. I use a router. Sometimes, after reconnecting, it will say I have "limited or no connectivity" before connecting fully again a second or so later.

This happens once every half hour or so, although it some times happens more frequently or less frequently.

I have checked the plugs and wires that connect my computer to the router, and they appear to be fine. I have also tried disconnecting the router, leaving it for a few minutes, and reconnecting. After logging out and logging back in, it still has the problem.

Often it disconnects every 5 minutes or so, which disrupts my downloads and often forces me to start over.

It doesn't change anything when someone calls me. It's never disconnected during a phone call.

I doubt it's the router either, as there are a couple other computers in the house on it that do not have this problem.

Any suggestions or help would be appreciated.

Thanks in advance.

Okay, I'll try that and report back.

Strange that it worked for a few years up until a few weeks ago.

Nope, it's still happening.

Any other ideas?