Hi,
Have you checked in the Event Viewer? Anything useful recorded out there?
Try to repair your Office installation via Control Panel and see if this will correct the issue:
https://support.office.com/en-us/article/Repair-an-Office-application-7821d4b6-7c1d-4205-aa0e-a6b40c5bb88b
Not sure what's the frequency of this issue, you might also want to perform a clean boot in Windows, then monitor the issue again. This will help us to determine whether the issue was caused by any software conflicts:
https://support.microsoft.com/en-us/help/929135/how-to-perform-a-clean-boot-in-windows
By the way, consider posting in the following dedicated Lync forum. That's where most of the Lync experts hang out, you should get more professional responses out there:
https://social.technet.microsoft.com/Forums/lync/en-US/home?forum=ocsclients
Hope this helps.
Regards,
Ethan Hua
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