DllHost.exe crash, faulting module ntdll.dll - On SBS2008 SP2 - 64bit

Hello,

I have a SBS2008 SP2 - 64bit running Exchange and SQL.

There is a recurring error (every days, up to 6 times a day), which may lead to a complete freeze of the server (not always).

Faulting application DllHost.exe, version 6.0.6000.16386, time stamp 0x4549b14e, faulting module ntdll.dll, version 6.0.6002.18541, time stamp 0x4ec3e39f, exception code 0xc0000374, fault offset 0x000abc4f, process id 0x1200, application start time 0x01ce289b242ac360.

<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">

-<System>

<Provider Name="Application Error" />

<EventID Qualifiers="0">1000</EventID>

<Level>2</Level>

<Task>100</Task>

<Keywords>0x80000000000000</Keywords>

<TimeCreated SystemTime="2013-03-24T20:40:49.000Z" />

<EventRecordID>99182</EventRecordID>

<Channel>Application</Channel>

<Computer>SERVER.domain.local</Computer>

<Security />

</System>

-<EventData>

<Data>DllHost.exe</Data>

<Data>6.0.6000.16386</Data>

<Data>4549b14e</Data>

<Data>ntdll.dll</Data>

<Data>6.0.6002.18541</Data>

<Data>4ec3e39f</Data>

<Data>c0000374</Data>

<Data>000abc4f</Data>

<Data>19c4</Data>

<Data>01ce28cfde46193e</Data>

</EventData>

</Event>

Do you have any idea about the cause and the potential solutions ?

Thanks in advance for your help.