Connection dropping

I’ve been having ongoing issues with my Xfinity internet connection dropping out regularly across all devices in my household. This includes cellphones, smart TVs, and gaming consoles — the interruptions are especially noticeable during online gaming sessions. From what I can tell my gateway never fully loses an internet connection, it just seems to be brief interruptions lasting a minute or so. 

To try to fix the issue, I went to my local Xfinity Store and upgraded my gateway to the XB8 model. Unfortunately, I’m still experiencing the same frequent disconnections.

I’ve already checked the basic things — rebooting the modem, verifying cable connections, and going through the logs available on the admin site (to which I didn't see any connection logs available to examine). Additionally I've attempted to use the Xfinity app support bot without success. It just says my connection seems great and ends the troubleshooting rather quickly.

Is there anything that can be done about this issue? 

Thanks in advance