OutlookGoogleCalendarSync: Recurring master appointment update failed. [0x800706BA] during GetCOMIPFromRCW()

Checklist:-

• Upgrade to the latest release (alpha if available)
• Reproduce the issue
• Complete the information below
• Provide your OGcalsync.log file (see how-to)

OGCS Version: v2.9.3.0
Edition: Installed / Portable
Sync Direction: G->O / O->G / O<->G

Bug Description
Since most recent update (2.9.3.0) I occasionally (once or twice a day) get the message below. Once it happens it´s a permanent issue. If I kill the app and restart all is OK. Until the next time…

NB - It´s not clear that anyone monitors these threads and I know a lot of other people are experiencing the same problem, so FYI - I have solved the problem by reverting to 2.9.1.0. Of course YMMV. Good luck!

"Appointment update failed. Unable to cast COM object of type 'System.__ComObject' to interface type 'Microsoft.Office.Interop.Outlook.MAPIFolder'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{00063006-0000-0000-C000-000000000046}' failed due to the following error: The RPC server is unavailable. (Exception from HRESULT: 0x800706BA)."

Steps to Reproduce the Issue

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Any other information
Any additional information that may help troubleshoot the issue.
📎 Attach your OGcalsync.log file. There is no OGcalsync.log File for today´s date (ie most recent failure).