2008R2 Remote Desktop Services - Winlogon.exe keeps crashing

Hello,

2008R2 SP1, 64GB RAM, 8CPU.  Running, session host, RDS gateway, remote app. Latest patches.

System becomes unresponsive to logins, users on the system have no issues and i have to power cycle the vm to get it to respond to logins again. I have not been able to determine why the process keeps crashing but it is happening every day.

Any ideas?

Log Name:      Application
Source:        Microsoft-Windows-Winlogon
Date:          7/24/2015 3:19:10 AM
Event ID:      4005
Task Category: None
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      nan-ts-vpts01.nan.local
Description:
The Windows logon process has unexpectedly terminated.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Microsoft-Windows-Winlogon" Guid="{DBE9B383-7CF3-4331-91CC-A3CB16A3B538}" EventSourceName="Winlogon" />
    <EventID Qualifiers="49152">4005</EventID>
    <Version>0</Version>
    <Level>2</Level>
    <Task>0</Task>
    <Opcode>0</Opcode>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2015-07-24T07:19:10.000000000Z" />
    <EventRecordID>3023230</EventRecordID>
    <Correlation />
    <Execution ProcessID="0" ThreadID="0" />
    <Channel>Application</Channel>
    <Computer>nan-ts-vpts01.nan.local</Computer>
    <Security />
  </System>
  <EventData>
    <Binary>02010000</Binary>
  </EventData>
</Event>