We were seeing these errors on a XenApp 6 farm:
Faulting application name: svchost.exe, version: 6.1.7600.16385, time stamp: 0x4a5bc3c1
Faulting module name: scardhook64.dll, version: 6.0.0.10226, time stamp: 0x4b8ca08e
Exception code: 0xc0000005
Location
Deptive - Commercial Bay
11-19 Customs Street West St
Commercial Bay Tower, Level 17, Room 1715
Auckland 1010
Contact Details
0800 000 141
Postal Address
PO Box 34797,
Birkenhead, Auckland 0746