PS. Backup power strips are a good idea for mission critical applications
PPS: are you sure it is the drive? It might be the encasement too...
Indeed, another "can of worms" to deal with, enclosures are often the source of trouble. I always buy separates, that is I buy the enclosures then I buy the drives, and if the enclosure doesn't allow hot swapping of those drives, then it's no sale.
The most reliable enclosures have a built in power supply, and the least reliable use external "wall warts" or "power bricks" for their power supply. Just turning off and on those units that use external power supplies can result in a power supply failure, rendering the enclosure inoperable. Best case for longe life is to leave the power switch in the on position.
Enclosures with a built in power supply are not as easy to find, and usually they are more expensive than units that use external power supplies.
Many people buy the combination enclosure with drive installed, and those are not designed to allow user access that permits swapping out the drives at will. Those setups usually come with installed software for backups, and I do not want that software, I have my own, so just give me a bare drive, thank you very much.
So, if one of my drives, or one of my enclosures goes south, I only need to replace one of them, not both, and I don't have any issues with that unneeded built in software. YMMV