PRS-T3: Write protected

Hi,

I have the following problem:

When I connect my PRS-T3 while calibre is running, I often get the error message that my PRS-T3 is write protected.

After I close and restart calibre while my PRS-T3 stays connected, everything is fine and I do not receive any error messages.

This behaviour started some versions ago.

Regards,

McDummy