Intermittent Exchange connection problems "0x8001011D ( The marshaled interface data packet (OBJREF) has an invalid or unknown format." (4264255)

Amongst usual activity there are found to be frequent Exchange connection errors in the event log similar to the following:

ID:    32622
Event Type:    Warning
Level:    Normal
Event Header:    Exchange Layer
Date:    2015/12/07
Time:    10:55:07.669
Description:
Error occurred while retrieving data from the Exchange server. [ 0x8001011D ( The marshaled interface data packet (OBJREF) has an invalid or unknown format. [EIP: 0x0042D69D,0x0042CDB6]) ]

MAPIServ.log has the following messages in it:

07/12 16:00:04:057 | ACSMAPIServObj.cpp(1001)       | 2344 | Exiting CACSMAPIServObj::SetProperties2Apply
07/12 16:00:04:057 | MAPIServImpl.cpp(108)          | 4656 | *** EXCEPTION Exiting CMAPIServImpl::SetAttachments
07/12 16:00:04:057 | MAPIServImpl.cpp(56)           | 4656 | *** EXCEPTION Exiting CMAPIServImpl::SendMessageW
07/12 16:00:04:057 | ACSMAPIServObj.cpp(48)         | 4656 | *** EXCEPTION Exiting CACSMAPIServObj::SendPacket
07/12 16:00:04:057 | ACSMAPIServObj.cpp(64)         | 4656 | Error: The marshaled interface data packet (OBJREF) has an invalid or unknown format.
 0x8001011D
07/12 16:00:04:057 | ACSMAPIServObj.cpp(255)        | 4656 | Receive ShutDown command
07/12 16:00:04:057 | ACSMAPIServObj.cpp(268)        | 4656 | Waiting synchronize thread