Screenshare Stuck on Pause

[CiaranI]

When my colleague attempts to share at the beginning of a meeting, the screen we see is black with a "[NAME] is sharing their screen" message. He tells me that his screenshare is paused, and he is unable to un-pause.

This happens consistently- the fix is for him to leave and rejoin the meeting. This consistently works, but is there anyway to identify and solve the root cause of the problem?