My Ping Spikes Every 10-15 Minutes.

My ping is spiking every 10 to 15 minutes. It has been doing so for several months but I have not gotten around to contacting Xfinity about it until now. I notice it the most when playing games or streaming shows on my PC but also notice it on my smartphone and smart TV. I have tried resetting my modem and troubleshooting online. Nothing has worked. This happens even when I have no programs running on my PC. I used the app PingPlotter and just like I noticed when playing games, my ping spikes from the normal 20-50 to 1500+ at almost regular intervals of 10-15 mins. My upload and download speeds are okay (130Mbps down and 73Mbps up). I typically use a TP-Link ethernet adapter to connect ethernet to my PC upstairs (my modem is downstairs) but have also tested PingPlotter and gaming/streaming with Wifi and experienced the same issue. My connection never hard drops though, and after a 5-10 seconds of spiking my ping returns to normal. What can be done to fix this?