The drive is designed such that if there are problems it freezes all further updates so the files on the drive aren’t lost.
If you were loading all your pictures into SecureAccess that could well explain the freeze ups. It wasn’t designed for that kind of load. The pictures should be loaded to the drive along side SecureAccess’s vault.
At this point back up your pictures and return the drive for a free replacement.
http://kb.sandisk.com/app/answers/detail/a_id/5232/~/return-material-authorization-(rma)-process
