Bluescreen errors including the following can happen randomly in Windows server VDAs. This problem can happen with Vmware Hypervisor or Hyper-V:
0x0000000a - IRQL_NOT_LESS_OR_EQUAL
0x0000001a - MEMORY_MANAGEMENT
0x000000fc - ATTEMPTED_EXECUTE_OF_NOEXECUTE_MEMORY
0x0000004e - PFN_LIST_CORRUPT
0x00000050 - PAGE_FAULT_IN_NONPAGED_AREA
0x0000003B- SYSTEM_SERVICE_EXCEPTION

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For Vmware :
Windows 2008 R2, Red Hat Enterprise Linux and Solaris 10 64-bit virtual machines blue screen or kernel panic when running on ESXi 5.x with an Intel E5/E7/E3 v2 series processor (2073791)
http://kb.vmware.com/selfservice/microsites/search.do?cmd=displayKC&docType=kc&externalId=2073791&sliceId=1&docTypeID=DT_KB_1_1&dialogID=249262203&stateId=1%25

For Hyper-v: 

Host Microcode update for Intel processors to improve the reliability of Windows Server
https://support.microsoft.com/en-us/kb/2970215

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Problem Cause

Compatibility issue between Hypervisor and Intel processor was causing the VMs to bluescreen which resulted in session disconnection.

Vmware hosted PVS streamed Windows Server VDAs might Bluescreen randomly. If the user is working on the server/desktop at the time of the issue, they will notice that the session suddenly disappears and all their data is lost.