Hello,
I get more or less the same problem with my WD10EZEX, long freezes and it going to 100% usage when I launch some games. Now, after I tried fixing it by scanning and repairing under the HDD’s Properties tab it crashed my computer totally. This I think is strange because my windows is on a SSD. Had to disconnect the HDD from the computer in order to be able to start it again.
Now my question is, did you contact WD and was their answer any usefull to you? And if it was can you share it here please?
Regards!
P.S. I’m no english speaker and not too good with computers 
