ctrcan you upload another video with net_graph on? it sounds like an internet issue more than anything else
It's not happening as of now since I restarted it yesterday, but it does show a red spike like in this image I found searching for solutions https://steamcommunity.com/sharedfiles/filedetails/?id=183787417 just bigger nothing else ever really changed when I looked at it in the past. It definetly is an internet issue it happens on any server and any online game.
codiakAre you playing on wifi by any chance?
No I play on ethernet on my computer. I will play on wifi from time to time on my switch but testing shows I get that disconnection error on both wifi/ethernet playing Mario Kart.