Drives are getting down

Hi Experts,

We are experencing the below issue with our SL150 library

tld0 cannot dismount drivex slotx already full. Let me tell you that it has 8 drives and we all drives gets down frequently and tapes get stuck on it for long time.

We didnot move tapes physically and didnot do anything with the library. Its not the issue when tape is inside the drive and somebody moves the tapes.

Pls suggest.