Recently I started getting a weird issue with my 500gb WD drive (which I’ve been using without problems for a couple years prior). After a few minutes/hours of use, the PC will just start locking up. Once I reboot, BIOS will not always detect the drive at startup. Sometimes it will, sometimes not. The other WD drive I have in the system functions fine and if I remove the 500gb drive entirely, system functions flawlessly. I downloaded WD diagnostic tool and ran both short and long (2+ hours) tests, but they both came back without errors… but there definitely seems to be something wrong with this drive. Should I RMA it? I just wonder what happens when WD folks test it and it works during tests (like it has been for me, at times before freezups).