I recently added an RE650 to my network. It is connected to my TP-Link router with a cable. The router is in the basement. The RE650 is in Access Point mode and it's on my main floor in a central location.

I have several devices in my small home connected to the RE650 via 2.4 Ghz and 5 Ghz.

The devices on 5 Ghz seem fine.

The devices on the 2.4 Ghz network drop very often. Sometimes they are fine for a few hours; but sometimes they drop every 5 minutes, even if they are only 10 feet away.

I have taken the 2.4 Ghz network off of AUTO channel, and I have tried selecting different channels but it doesn't seem to make a difference.  I am using a WiFi Analyzer app on my phone to see the other networks available in the air, and I see my neighbours all have their on 2.4 networks which all overlap. I've tried picking channels the fewer people are on, but my 2.4 still drops.  I can see my network appear in the list, and then it's randomly gone for a few minutes, and then it randomly comes back for a few minutes.

Any thoughts on why this happens?

Is there any way to track down what the problem might be?  Like is there some kind of log on the device which can tell me WHY it's dropping the devices off of 2.4 randomly?