Is your situation similar to the various ones reported in the bugs and technical issues subforum?

Example threads: https://steamcommunity.com/app/892970/discussions/1/5427423328666020965/
https://steamcommunity.com/app/892970/discussions/1/5427423328680658511/

or

Originally posted by JerKooL:

Yes they did a change to the Garbage Collection and adjusted how the game saves on 9-12-22 making many problems that people are having currently and its all being blamed on the internet providers at the moment.. Having same thing happen to me and my brother in a different state and on a different provider. If your online it will lagspike frames but also show you as super high ping and kick you from servers and hosted games. We are hoping for a update to fix this but its being pushed into the back ground so it might not. Right before a DLC push and 1/4 of your player base cant stay connected to your game might be tough on them. Tho the crossplay they are working on will offset that PC player loss so who knows if it will be fixed for us. We hope it will before we move to Evil West release in November.