I can also confirm this issue with 80+ players, sometimes we can go an hour or two without any desync at all. All of a sudden the desync will kick in, people can't see anybody else moving & the server has to be restarted.
We get lots of erros like this spammed down the client side log when ever it happens, there seems to be no pattern to it's occurences.
0:48:36 Message not sent - error 0, message ID = ffffffff, to 1657523928 (WOLPAWEGG)
20:48:36 NetServer::SendMsg: cannot find channel #1657523928, users.card=90
20:48:36 NetServer: users.get failed when sending to 1657523928
This is all since the patch update. We never had desync before & have tried all of your config suggestions, unfortunately none have had any effect. This really needs to be fixed as we're losing players daily.