Intermittent internet connection

I've been experiencing intermittent internet connection for the past 2 months. First occurrence was November 3rd, 2023. My service is for 1200mbps, but for around 80% of my day, it has been hovering around 0.4mbps - 5mbps (~0% of my service!!!) on both ethernet and WIFI.  The upload speed was the only thing that was normal at ~50mbps. The only workaround that I had was to restart/power cycle the gateway to get normal speeds, but even then I'd be lucky to have it for about an hour. The latency and packet loss has been horrible, making it extremely difficult to do anything that I want or need. I tried to give Xfinity the benefit of the doubt as I read that 10G was being implemented, with this would be a circumstance that would happen, but 2 months is crazy.