Ever since 1.42 the server will crash when it reaches full up we have found putting a BEC slot limiter with 3 reserved slots on it helps so it never reaches full (less crashes) however it has been known to crash (arma3server.exe has stopped responding) with 20 players on at 3am in the morning.
We have found that using the forced BI malloc makes it worse and there is less crashes with Fred41 malloc.
The point we are trying to make is that Prior to 1.42 there was no desync with 120 players on the server and the server never crashed for a number of months.
I can also confirm our KOTH server has been crashing a recorded of 11 times since the release of 1.42
As it seems nothing is getting done or as your Arma 3 twitter account states "not the crashes, because we still don't have useful crash reports for them" despite reports already on here we have decided to provide you with our logs everytime the server crashes so this feedback report might get rather large.
I can confirm we are running the Dwarden performance binary v2... without this the servers are completely unplayable
As for the desync it comes and goes, without fred41 malloc and dwardens binary again with desync the server is unplayable we find the fred41 malloc and dwarden binary minimizes the server lag and desync.
To rule out issues our end we have tried everything even reformatting but the issue remains across 2 servers.
Lets talk about mods... we are running Altis Life and before you target that as the issue i would like to point out again the server was a complete joy to play with very little to no desync and no crashes before 1.42
I know BI doesn't really like mods/server scripts however i can assure you a very large number of people have bought arma 3 just to play on our server and only play altis life and on our KOTH server so you should really welcome the custom scripts!
Hope these feedback reports help out and anything you want us to try we will certainly give it ago!