Neighborhood is experiencing WiFi drops consistently

Hi, my family has been Xfinity customers for 10+ years as it was the only provider in the area. We upgraded to the gateway modem with 1gbps service and it was fine for a while. Over the past couple months we started to notice our service was dropping consistently maybe 5-10 times a day. I also recently got a gaming PC and noticed there is significant packet loss with an ethernet cable plugged in. Others in our neighborhood are also experiencing similar battles and we need help. I personally believe there is an issue with underground cables that run through the neighborhood (which would explain the group issue), maybe some cable damage which would also explain the packet loss!

If there are issues with the underground cables how does that process work of identifying the problem, and finding a solution?