I've had an SSD that was failing to be recognized for weeks, and before I shipped it back (Filled out the RMA and got a label), windows updates turned off my computer.
When I booted it up, the SSD was working fine. I just needed to power cycle the SSD to fix it, and i hadn't even turned off my computer in weeks.
Why would you leave your PC on for weeks continously anyway? ^^
Nightly backups and use as build slave/helper for distributed builds?