Unreliable Service Across the Board

Okay, so my apartment complex only offers Cox. A few months ago, my internet would cut out, and my router light would be red. I’d unplug it and wait a bit, and it would come back on, but it would do that at least once a day, sometimes two or three times. The router was old, so I upgraded, and that helped for maybe a week or two, but then the same issue came up. I moved the router to my living room in case the issue was with the port, but the same thing is happening. I’ve contacted cox, they reset the brand new router, ran tests, the equipment is fine. It’s really frustrating to not have reliable service and to constantly have to unplug the router and reconnect devices. It sounds like this is a chronic problem for lots of people. Has anyone found a solution?