You said you had no issues for years. So it was working good.
My USB port will only take certain usb sticks. Mine did the same thing as yours. Starting and stoping and starting over when it lost connection.
It has to do with the socket on the bike. Ive only found one no name stick that works. Didn't matter how it was formatted.
The others would work if I held them just right in the port or socket.
I have tried half a dozen or more with only one that works.
So,,,, good luck.