Chromebook rejecting my wifi after a few minutes

I've recently had my wifi router upgraded (Xfinity) and am no longer able to use certain games (like online MMORPG games and also some of my online schooling) or apps without it eventually kicking me off and saying I'm no longer online. I've tried to forget my password and re enter, I reset and power washed my Chromebook and router.. I've factory reset the Chromebook as well. Went into the settings and also tried to change the DNS or whatever it was called and also didn't work. I feel like I've tried everything. Went on Xfinitys app and tried changing the advanced security.. nothing. My YouTube wouldn't even work there for a hot minute. I just recently bought this Chromebook no more than 6 months ago. Anyone think they can help me out? 🥹