We've been getting the same problem consistently. It either crashes when the game goes on for 2 hours or more or when a player joins in after about 30 minutes or more. Every RPT ends with the same error you described. We use quite a few mods, but we haven't been able to reproduce this on any other game mode. I will post my RPT when I get the chance

Edit:
Here's my startup commands

-port=2582 -MaxMem=16384 "-servermod=" "-mod=@CBA_A3;@ace;@ACRE2;@RHSUSAF;@RHSAFRF;@RHSGREF;@RHSSAF;@ALiVE;@aliveserver;@3CBFactions;@ACEAdvCPR;@ACEDiwakoRagdoll;@ACESplint;@Achilles;@Align;@BackpackOnChest;@BlastStandalone;@BreachCharge;@CTabDupe;@CUPTerrainsCore;@CUPTerrainsMaps;@Immerse;@MarauderGear;@SOUG;@Spyder;@Suppress;@tfvfac;@VcomAI;@hmd;@hmdrhs;@ProjectBJC;@ACEX;@USP;@offroad;@KAT;@Boxloader1;@Boxloader2;@torabora;@hazarkot;" -profiles=ARMAHOSTS -config=ARMAHOSTS\server\server.cfg -cfg=ARMAHOSTS\server\basic.cfg "-name=armahosts" -Server

That is blastcore, yes.

Aliveserver was ran as a server mod today. Crash happened once again.

ACEAdvCPR and the other medical mods are 100% compatible because we do not use the newest version of ACE because of its butchering of the medical system and we will not use it until it is fixed.

We don't know if this issue is even ALiVE related anymore. Earlier today we ran a different mission (a modified Evannex scenario) and the error happened again; player joined the game and we received the same crash at the end. It could be ACRE, VCOM, or any other mod at this point.

We ran our test. We could not reproduce the error with Task Force Radio instead of ACRE2 after many attempts and playing for quite a few hours. We had players leave and try to rejoin, which usually causes the crash to happen, and no joy. Very odd.

I can't imagine ACRE2 is fully to blame because so many groups use it and don't report this problem. I haven't found any bug reports about this that mention ACRE2 other than this thread.