USB sticks are no longer recognized?

Hello folks,

The following problem:

I was playing pictures from my USB drive on my PC. I had to leave for 15 minutes and left the USB drive plugged in. When I came back, the PC was in standby. When I restarted, the USB drive was recognized, but had a different name and was no longer accessible. It only showed 0 kb.

The same thing happens on another PC, it is recognized but has a different name and no access.

Formatting doesn't work either! Message: Windows could not complete the formatting

Unfortunately this is not an isolated case, there are already 5 sticks with the same problems.

Are there any solutions for something like this or what exactly is it?

Are there programs for restoring the flash drive? (There were still pictures on it)

Thank you very much in advance.

LG Michael