Lync 2010 application service stops unexpectedly

Question

Lync 2010 enterprise application service stops unexpectedly and requires a manual restart. This happens sporadically but can't find anything obvious as to the reason why.

Answer 1

Thank you for responding, sorry it took so long to get back to this. 
First error:
Log Name:      Lync Server
Source:        LS MCU Infrastructure
Date:          11/19/2013 9:43:03 AM
Event ID:      61026
Task Category: (1022)
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      (FQDN removed)
Description:
Unhandled exception was thrown.
The process ASMCUSvc(3440) throw an unhandled exception:System.AccessViolationException.
Stack:
   at CRDPTransportStreamBuffer.FinalRelease(CRDPTransportStreamBuffer* )
   at ATL.CComObject<CRDPTransportStreamBuffer>.{dtor}(CComObject<CRDPTransportStreamBuffer>* )
   at ATL.CComObject<CRDPTransportStreamBuffer>.__vecDelDtor(CComObject<CRDPTransportStreamBuffer>* , UInt32 )
   at ATL.CComObject<CRDPTransportStreamBuffer>.Release(CComObject<CRDPTransportStreamBuffer>* )
   at ATL.CComPtrBase<IRDPSRAPITransportStreamBuffer>.{dtor}(CComPtrBase<IRDPSRAPITransportStreamBuffer>* ).
Inner exception:
Attempted to read or write protected memory. This is often an indication that other memory is corrupt..
Cause: This is caused by an unhandled exception in the server. Please contact product support.
Resolution:
Internal error.
Event Xml:
<Event xmlns="removed">
  <System>
    <Provider Name="LS MCU Infrastructure" />
    <EventID Qualifiers="50174">61026</EventID>
    <Level>2</Level>
    <Task>1022</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2013-11-19T15:43:03.000000000Z" />
    <EventRecordID>332797</EventRecordID>
    <Channel>Lync Server</Channel>
    <Computer>(removed)
    <Security />
  </System>
  <EventData>
    <Data>ASMCUSvc(3440)</Data>
    <Data>System.AccessViolationException</Data>
    <Data>   at CRDPTransportStreamBuffer.FinalRelease(CRDPTransportStreamBuffer* )
   at ATL.CComObject&lt;CRDPTransportStreamBuffer&gt;.{dtor}(CComObject&lt;CRDPTransportStreamBuffer&gt;* )
   at ATL.CComObject&lt;CRDPTransportStreamBuffer&gt;.__vecDelDtor(CComObject&lt;CRDPTransportStreamBuffer&gt;* , UInt32 )
   at ATL.CComObject&lt;CRDPTransportStreamBuffer&gt;.Release(CComObject&lt;CRDPTransportStreamBuffer&gt;* )
   at ATL.CComPtrBase&lt;IRDPSRAPITransportStreamBuffer&gt;.{dtor}(CComPtrBase&lt;IRDPSRAPITransportStreamBuffer&gt;* )</Data>
    <Data>Attempted to read or write protected memory. This is often an indication that other memory is corrupt.</Data>
  Followed by this error
Log Name:      Lync Server
Source:        LS ApplicationSharing Conferencing Server
Date:          11/19/2013 9:43:03 AM
Event ID:      32037
Task Category: (1304)
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      (FQDN removed)
Description:
An unhandled exception was encountered.
Message=System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
   at CRDPTransportStreamBuffer.FinalRelease(CRDPTransportStreamBuffer* )
   at ATL.CComObject<CRDPTransportStreamBuffer>.{dtor}(CComObject<CRDPTransportStreamBuffer>* )
   at ATL.CComObject<CRDPTransportStreamBuffer>.__vecDelDtor(CComObject<CRDPTransportStreamBuffer>* , UInt32 )
   at ATL.CComObject<CRDPTransportStreamBuffer>.Release(CComObject<CRDPTransportStreamBuffer>* )
   at ATL.CComPtrBase<IRDPSRAPITransportStreamBuffer>.{dtor}(CComPtrBase<IRDPSRAPITransportStreamBuffer>* )
Cause: Application Sharing Server error. Look through the exception details for more information.
Resolution:
If the problem persists, please contact product support.
Event Xml:
<Event xmlns="removed">
  <System>
    <Provider Name="LS ApplicationSharing Conferencing Server" />
    <EventID Qualifiers="50456">32037</EventID>
    <Level>2</Level>
    <Task>1304</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2013-11-19T15:43:03.000000000Z" />
    <EventRecordID>332798</EventRecordID>
    <Channel>Lync Server</Channel>
    <Computer>(removed)
    <Security />
  </System>
  <EventData>
    <Data>System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
   at CRDPTransportStreamBuffer.FinalRelease(CRDPTransportStreamBuffer* )
   at ATL.CComObject&lt;CRDPTransportStreamBuffer&gt;.{dtor}(CComObject&lt;CRDPTransportStreamBuffer&gt;* )
   at ATL.CComObject&lt;CRDPTransportStreamBuffer&gt;.__vecDelDtor(CComObject&lt;CRDPTransportStreamBuffer&gt;* , UInt32 )
   at ATL.CComObject&lt;CRDPTransportStreamBuffer&gt;.Release(CComObject&lt;CRDPTransportStreamBuffer&gt;* )
   at ATL.CComPtrBase&lt;IRDPSRAPITransportStreamBuffer&gt;.{dtor}(CComPtrBase&lt;IRDPSRAPITransportStreamBuffer&gt;* )</Data>
  </EventData>
</Event>