It's been going on the past week. I would suddenly ping spike to 1000-2000 and be forced to leave the server, but then my connection immediately returns to normal once I leave.
The only change to my connection recently was adding a port to forward for another game.
Edit: Last few rounds, it's just been going between 60-120 the entire round this time with a few 500+ping moments that recovered. No other activity on my network.
Edit2: Switching out my adapter seems to work better so far. Locking for now.