Did they get corrupted out of the blue or because of force shutdown / reset / power failure ?
I have the same ssd too but didn't encounter this yes , still this frighten me as it could happen to me too. We all know that all previous intel ssds had one problem or another. Beside selling this drivers with 2 different firmwares, intel refuses to offer firmware updates to users. While intel competiors using the same controller have been releasing improved firmware, for whatever reason intel doesn't work on improving the firmware in 510, which is by far from perfect.
What firmware your drive has? Mine is PPG4 .
Contact Intel support.
They got corrupted our of the blue. That's the scary thing. Just one morning, chkdsk ran when I started up and my excel file was gone (0 bytes file size so it's not an Excel corruption issue).
The concern is, how many OTHER files are bad that I don't know about yet...
Tech support did answer (I was surprised). I was told to keep test it and if it happens again, to RMA it. I guess it's 3 strikes and your out.
How do you know what firmware you got?
In such case I would suggest you effective professional recovery software
Make use of next one http://www.recoverytoolbox.com/repair_excel.html it will restore *.xls, *,xlt, *.xlsx, xlsm, *.xltm, *.xltx, *.xlam file formats