Bad Tape Error Power vault TL2000

Hello,

I have an error on Power vault TL2000.

"Bad Tape" error appear on some slots. Yesterday there was 6 slots with this error message, after diagnostic system the errors disappear. today I see three slots with error "Bad Tape"

The cartridges are all new. Anyway I changed them with new tape again but this error appear again.

Please help!

Thank you