Losing internet

Every day around afternoon time my internet goes out, this has been happening since the major outage a few months ago. It don’t matter how many times I reset the router, it really don’t help at all. It’ll take 15-20 minutes to get back to normal n after that it will work just for the rest of the day but it’s just so annoying n so predictable n the message system that Cox has it doesn’t work either, every time I tried sending them a message I get the not delivered response!  Is this happening to anybody else?