So when I booted up my PC today, only one of my 2 M.2's were detected in device manager. I then went to check if I could find it in BIOS, but I still only saw one. I tried reseating the M.2. but this did nothing. Now I'm not sure what to do. The M.2's are exactly the same type (Corsair Force Series MP510 960GB M.2 SSD), and I've had them for about the same amount of time (1.5 years). The motherboard is an "ASUS ROG STRIX X470-F". I haven't done anything out of the ordinary, this kinda just happened out of nowhere.