I have not replied back since January because I wanted to make sure.

I have a Motorla Surfboard for years too. My setup was fine for years, similar to KGG because of TV Tuner card. My amplifier was fine too.

What I determined was a bad multi-splitter in the attic. As soon as I removed that 4-ways splitter and replaced it with a single straight connector in the attic, everything was fine. I am not sure if the insulation stuff shorted the splitter but as I shared before, the straight connector in my room was warm. I didn't even know a multi-splitter could go bad.

So anyway, it was not the router or the modem. It was the multi-splitter. I have 2 multi-splitter intersection points and 3 straight connectors between the cable from outside my house to my router. I know it is alot but it is the only way to run the lines in my house.