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Why is my Activator.CreateInstance call interrupted?

I use the following code to access the Windows Explorer Explorer group site service:

Guid GUID_TrayBandSiteService = new Guid(0xF60AD0A0, 0xE5E1, 0x45cb, 0xB5, 0x1A, 0xE1, 0x5B, 0x9F, 0x8B, 0x29, 0x34);
Type shellTrayBandSiteService = Type.GetTypeFromCLSID(GUID_TrayBandSiteService, true);
site = Activator.CreateInstance(shellTrayBandSiteService) as IBandSite;

Basically, it works great. A very small percentage of the time (less than 1%) calling Activator.CreateInstance raises the following exception:

System.Runtime.InteropServices.COMException (0x80040154): Retrieving the COM class factory for component with CLSID {F60AD0A0-E5E1-45CB-B51A-E15B9F8B2934} failed due to the following error: 80040154.
  at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandle& ctor, Boolean& bNeedSecurityCheck)
  at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean fillCache)
  at System.RuntimeType.CreateInstanceImpl(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean fillCache)
  at System.Activator.CreateInstance(Type type, Boolean nonPublic)

I was looking for an error code and it seems to indicate that the service is not registered. I am almost sure that this is actually not the case, since the call will only work a few minutes later, and the CLSID is provided explorer.exe.

I'm at a dead end. What can cause Activator.CreateInstance to fail, but only rarely?

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? , , COM . - . , TrayNotify, TrayBandSiteService. , , .

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, , (UAC), . EXPLORER - COM-, TRAYNOT ( ) - COM-. EXPLORER . Microsoft , UAC - , - COM- , COM- , . COM COM- , . Microsoft , . COM .

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Activator.CreateInstance(typeof(MyType)) , Windows. , , wcf

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