Im from another community and we've been having exactly the same crashes. It also started round about the same time. We are about 25 players and the mods we have in common are:
@A3MP;
@AGM;
@ALiVE;
@ASDG_JR;
@ASR_AI3;
@AT4;
@CBA_A3;
@cTab;
@fhq_accessories;
@fhq_m4_a3;
@Hmmwv;
@@SUPER_flash;
@task_f orce_radio;
Its totally random who crashes, so its not the same people all the time. Sometimes you wont crash at all and sometimes you will crash often. we have tried: 1.checking game cache on steam 2. deleting content of DLL folder. 3. deleting MP mission cache. Even reinstalled the server and re-downloaded mods. One person that was crashing often, reinstalled windows, arma and the mods and he still crashes.
How it happens is, you'll get a very short pause, then a second later, another pause and then it crashes and tells you: Arma.exe has stopped working.
We ran a vanilla server and even still had crashes, but that was inconclusive.
My RPT where there was a crash at the end https://dl.dropboxusercontent.com/u/83517991/arma3_2014-07-29_20-47-00.rpt
and the minidump : https://dl.dropboxusercontent.com/u/83517991/arma3_2014-07-29_20-47-00.mdmp
I hope this helps in finding a solution. we have ran out of ideas.