Wanted to post some developments (also to give hope if anyone is having the same issue because most info I've found on forums ends suddenly), the issues have become more sparse as time goes on but are still happening occasionally. Tried a USB Wi-Fi adapter, narrowing down software running at the same time, factory resetting my router, checking Ethernet wires with a device, the works. On a whim I installed PingPlotter and found that when the network kicks happen, the connection to my modem/router is fine (which I believe confirms my hardware is OK), but the next hop to an IP belonging to an ISP all the way up to the destination hop have complete packet loss with no response ping. There doesn't seem to be a lot of jitter or extreme latency otherwise and I can use QoS on my router to improve that further if need be. Am I right in assuming this is likely my ISP's fault at this point or should I investigate my router/modem device as well? I'll be both relieved and fuming if that's the case; spent how many months going nuts diagnosing things because they insisted it wasn't on their end.