Could be that the drive is failing. Or it may just need to be re-seated. Either way, take the failed missing one out and put it the other drive in and see if it's detected by bios. If it is, put the failing one in slot 2 and see if it's detected there. If the mobo doesn't detect the good one in slot 1, it may be a bios/mobo issue. If the failing one isn't detected but the known good you moved to slot one is, it's a bad part and under warranty, rma it for a replacement.
this post was submitted on 26 Jul 2023
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Try leaving it plugged in without turning off power strip at night. if it boots fine then you may have a Motherboard battery issue, or your unpowered nvme drive is rapidly loosing data. They lose data over time when unpowered but we are talking months usually, not overnight. If it doesn't boot, could be a loose connection.