Only happened to me once, I did manage to get the error in console in which I believe should help the engineers fix this issue, this occured in Stickmasterluke’s Fencing game, however I doubt that it is place-related.
And the error as shown below,
Could not remove the UI even after hitting the X button, had to rejoin the game in the end 
I am on Windows 10, other than that unfortunately despite several attempts, I am unable to reproduce the bug, the only assistance I could provide is the coregui error in the screenshot provided above