I think i saw something equivalent maybe on discord but not sure so i post it here.
Ports are allowed in the router
Game allowed in the firewall
I was pulling a trailer with a truck equiped with a crane on it.
While driving on ice patch the sound cue from being disconnected from a lobby played and the truck i was driving disapeared along side all the object on the Lake Kovd location (both map).
It didn't affect Alaska or Michigan or Taymir.
Prior to that a player was trying to join the session while constantly getting disconnected or laging when he was on the map.