Something I read on a mission thread today, could be completely unrelated:

Crash Issue: "I and other users connecting to the mission keep getting a memory crash error!"
Temporary Workaround: For now, the only way around this is to set verifySignatures=2 on your dedicated server and perhaps also disable BattlEye.  The actual cause of the memory crashes are unknown.  It seems to occur sometimes when CUP Weapons, Units, and Vehicles are loaded.