From eggbeast:

we are getting server crashes on unsung mod. the mod and mission is the same, steam updated on server and clients
then as soon as the server was updated, and steam validated, no issues, we have been crashing every 1-2 hours all weekend.
We have noticed that when someone crashes a plane or heli and creates the crater field models, we are getting major frame drops - EVERY PLAYER experiences it across the map. when a player approaches the crater models, they get strong freezes, that last a few seconds, made worse when zooming in facing the craters.

my feeling is that these models are causing a major accumulating memory leak.

rpt has this which we've not seen before:
16:41:48 NetServer: users.get failed when sending to 1045375478
16:41:48 Message not sent - error 0, message ID = ffffffff, to 1045375478 (Elvis)
16:41:48 NetServer::SendMsg: cannot find channel #1045375478, users.card=18
16:41:48 NetServer: users.get failed when sending to 1045375478
16:41:48 Message not sent - error 0, message ID = ffffffff, to 1045375478 (Elvis)
16:41:48 NetServer::SendMsg: cannot find channel #1045375478, users.card=18
16:41:48 NetServer: users.get failed when sending to 1045375478
16:41:48 Message not sent - error 0, message ID = ffffffff, to 1045375478 (Elvis)
16:41:48 Client: Remote object 29:0 not found
16:41:49 Server: Object 5:26 not found (message Type_93)
16:41:51 Server: Network message 3e2d03 is pending
16:41:51 Server: Network message 3e2d03 is pending
16:41:51 Server: Network message 3e2d03 is pending
16:41:51 Server: Network message 3e2e8a is pending
16:41:51 Server: Network message 3e2e8a is pending
16:41:51 Server: Network message 3e2e8a is pending
16:41:51 Server: Network message 3e2e8a is pending
16:41:51 Server: Network message 3e2e8a is pending
16:41:51 Server: Network message 3e2e8b is pending
16:41:51 Server: Network message 3e2e8b is pending
16:41:51 Server: Network message 3e2e8b is pending
16:41:51 Server: Network message 3e2e8b is pending

and these - at the end of EVERY RPT file, it has the same error: related to accessing protected memory. i.e. the server has developed a memory leak since the 64 bit update.

1. Exception code: C0000005 ACCESS_VIOLATION at 404B5D47
2. Exception code: C0000005 ACCESS_VIOLATION at 40E35D47
3. Exception code: C0000005 ACCESS_VIOLATION at 407F5D47
4. Exception code: C0000005 ACCESS_VIOLATION at 40195D47

server logs in case anyone wants to take a look
http://server.elite-warriors.co.uk/eggbeast/projects/uns/beta/A3_server_crash_logs.rar