Slots are disappearing

Hello All,

I have DP 7.01 Installed on windows 2008R2, i am facing issues on the VTL created with 800 slots. i have 8 VTLs, backups were working fine suddenly the Slots from the VTLs are disappearing and causing jobs to fail, in the dataprtector 7.01 console. Every time i have to manually add these slots and scan. Even the TB Licenses are also changing from 12TB to 1TB. please any body can help.

thanks.