hackers crashing server

I have hackers crashing the server at will. I get a memory error and everyone players Arma 2 crashes as well.

They are banned but still seem to crash the server.
 
I get this in the RPT.

Fault address: DEADA575 00:DEADA575 Unknown module
file: DayZ_Epoch_11 (__cur_mp)
world: Chernarus

Registers:
EAX:53E4DB40 EBX:00000000
ECX:33F53A28 EDX:00000000
ESI:00000000 EDI:09F2B580
CS:EIP:0023:DEADA575
SS:ESP:002B:0161CAE8 EBP:65656565
DS:002B ES:002B FS:0053 GS:002B
Flags:00210246

and: Cannot load sound
'reeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeu¥Þ^x Ü”ÿø Äb“t'
=======================================================
-------------------------------------------------------
Exception code: C0000005 ACCESS_VIOLATION at DEADA575
 
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