Plex crashes when one particular user tries to access the server remotely

I run a Plex server on Mac and provide remote access to four family members. Until recently, each of them was able to access the server with zero problems. Starting a few days ago, one (and only one of them) began crashing the server each and every time he tried to access content. I have made no changes in configuration, OS, etc. whatsoever. He says he has made none on his end. Does anyone have a clue why three remote access guests have no problems, and one crashes the server the instant he tries to play any content from the server? Any insights truly appreciated.

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