Ah, I was looking over fixes I made thinking I made something wrong. We improved MP stability recently (for next patch). And Böhser being host, either it's on the public version or there is a mismatch of version, in both case the fixes aren't used. So I'll complete this ticket and we'll see after the hotfix is released ^^

There is nothing odd in the output log. I'm afraid it just hit the limit of what's the game is able to handle on your specs I'm afraid : / 5h+ on a 4p map, big map, lots of units. All those parameters affects performances a lot ^^"