Update Norton/Symantec AV. Two of the dumps have the same symptoms as this
THREAD.
STACK_TEXT:
f78c2b30 8052f640 00000050 e6be1002 00000000 nt!KeBugCheckEx+0x19
f78c2b80 804e2dfc 00000000 e6be1002 00000000 nt!MmAccessFault+0x796
f78c2b80 8b5473d9 00000000 e6be1002 00000000 nt!KiTrap0E+0xc8
f78c2c24 8b539364 00000001 8b52b004 f78c2cec srv!RemoveDuplicateCoreSearches+0x39
f78c2c68 8b534ce3 885c1eac f78c2cec f78c2cb4 srv!CloseIdleConnection+0x394
f78c2cc4 8b534aec 885c1d60 804f1d20 8b52aa88 srv!TimeoutSessions+0xf3
f78c2d4c 8b519b4f 8a4957f0 89698bc8 8859a3d0 srv!ScavengerAlgorithm+0x21e
f78c2d70 80585d7f 89698bc8 00000000 80582d80 srv!ScavengerThread+0x78
f78c2d80 804eebdb 8859a3d0 00000000 8a4957f0 nt!IopProcessWorkItem+0xf
f78c2dac 8059b35e 8859a3d0 00000000 00000000 nt!ExpWorkerThread+0xe9
f78c2ddc 805008e6 804eeb10 00000000 00000000 nt!PspSystemThreadStartup+0x2e
00000000 00000000 00000000 00000000 00000000 nt!KiThreadStartup+0x16