Internet issues PS5

I cant play anyone online with my PS5 its getting really frustrating, I can play PVE with some lag but when I play PVP like NHL 22 forget it. The connection will load, I have a good signal/ping --like 24-- but then someone will join, and  then within 2 mins I lose a connection. I know somethings wrong because we've had issues in the past where the signal cuts off and is sporadic. On there weekend at exactly 12AM Friday it wont work, but Monday its fine...Like clockwork  same time. The other techs solution was "get another box" but this is like the 3rd one. I cant go through 198.168--.1.1 because of the bridge mode and there's seems to be no clear indication or solution.

I have an Xfinity Gateway that's set up downstairs the Living room, there the Ethernet Cable (RJ45)cord goes to my bedroom where I have a night hawk wireless router in bridge mode and from there its hard wired does anyone have any ideas?

Thank you for taking the time and consideration to read this, I'm greatly appreciative