Ethernet not working with online gaming

So about 3 weeks ago I started encountering disconnection to online gaming and to their respective  clients ( steam, EA, Epic games ) all of my online web surfing like YouTube, Netflix etc... work just fine. I connect to my wifi via ethernet I've been using  ethernet for years now and everything was good until I started getting " no connection  on steam and ea " being kicked out of every online game I played . 

I replaced my ethernet cable , I got a new ethernet  port for my PC 

I updated my drivers and even updated my BIOS 

I went to the store and replaced  my modem for the 8th Gen and still ethernet wasn't working , 

I called a xfinity technician  for him just to tell me it's my device . 

He even replaced  my 8th Gen modem back to the 7th Gen and it worked  for a good hour but then it went to doing the same thing " no connection " 

I've done everything to my PC it's honestly  getting annoying everything I ask for help they tell me " try restarting " I've done countless times and nothing has fixed my problem , I'm honestly thinking switching  internet  providers to see if that's the problem .