Hello bluebelle you are back again 
Well the advice I gave you 8 days ago still is applicable I think.
Other solution could be to store some data in the cloud (not a big fan of that ) temporarily,
or on a external (ssd) drive.
Than run a thorough smart test on the drive you lost data on (and maybe also the other drives).
Not just the superficial test you did before.
Just some thoughts.
BTW did you try to connect the Hub your drives are in to another USB port ? There could ofcourse also be something wrong with the Hub.