Slow down every 3-4 months - call Xfinity and they tweak some settings and its back(after trying to sell me rubbish)

Thank you for posting on our community forums, RedEd23. I can definitely understand why you'd be frustrated, especially if you've experienced the same issue multiple times and have had to contact support repeatedly to get it resolved. While I can't speak to what may have caused the previous interactions, a recurring drop from around 900 Mbps to 300 Mbps could be related to several factors, including signal levels, provisioning, equipment compatibility, network conditions, or account configuration. Just to make sure we're on the same page. I'd like to ask some additional questions about the troubleshooting steps you've taken so far. Have you checked the coaxial connection on both ends (wall plate and modem) to make sure it's tight? Have you tried rebooting the modem manually or through the Xfinity App?