Hey there again, @Kuzes!
In order to determine what could be the source of the issue, you need to do some more troubleshooting. It's possible that the cable has failed, it's possible that the power supply to the drive is poor. You could also try plugging the WD Red internally via SATA (connecting to the mobo and to the PSU via the molex cable). Running the DLG utility from there could also help you determine whether or not there's anything wrong with the drive itself.
Unfortunately, there's no way to conclude that a hardware issue is present, since there are no clicking noises coming from the HDD, without some basic troubleshooting first.
Let us know how the WD Red is behaving afterwards.
SuperSoph_WD