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I had this in the old XZ1-forum in May '19 that all of a sudden, the USB-connection to the PC was not working anymore. The phone only charged with the charger. But USB remained complety unnoticed, even charging didn't work. And all of a sudden bäääääm two weeks later the USB-connection started working again. I was suspecting an app that blocked it with an update and an further update may have cured the mistake.
Now, Feb '20, all of a sudden the USB-connection is not working again anymore. Worked on Friday, didn't work on Monday. Tested on multiple PCs, laptops, cables. Nada.
I really hope that the thing cures itself within the next two weeks like last time. Nightmare...
Still not working.
End of March, admidst among the Corona crisis, all of a sudden the phone gets at least charged again when plugging it into the USB-port of the PC.
Still not recognised for file transfer though. However the charging is again working.
Whatever app is still blocking my USB port, I hope that this is fixed soon myseriously like the last times (!) before.