Can you all please post your system information?
Maybe there's something in common with your Macs.
Open a terminal (e.g. by typing terminal into spotlight).
Run the system profiler to copy selected system information to the clipboard, by copying the command line below into the terminal and pressing enter:
system_profiler -detailLevel mini SPHardwareDataType SPSoftwareDataType SPDisplaysDataType SPAudioDataType | pbcopy
Now start a new reply to this post, and paste the clipboard into it, by pressing Command + V.
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