M.2 NVMes disappearing and not working at random

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   I have an Asrock B650M-HDV/M.2 and I've just gotten another NVMe since the mobo has 2 M.2 slots, so I wanted to expand the storage a bit. The board has a topmost Gen5 slot with a heatsink, and a Gen4 slot under the GPU that's just using one screw to hold the drive.

The issue is that the new drive, which is a Gen4 LEXAR 1TB NM790, isn't working at all in the lower slot, and the old drive, WD Blue SN550, works in both, but frequently disconnects when used in the lower Gen4 slot. These are Gen3 and 4 drives so they should both be working in both slots, so I'm not sure why Lexar only works in the upper one or while SN550 disappears when used in the lower slot. Lexar is currently much hotter than the WD drive at 52c idle in the heatsink slot for some reason (not sure if Gen4 generally runs much hotter), while the WD is at 35c in a non-heatsink slot, and lane sharing isn't a thing for this mobo so both drives should work even though I have 4 SATA drives connected as well. I've noticed that SN550 disappears usually after putting the PC to sleep, but it can also happen during normal usage sometimes.

Also, the SN550 was having this same issue (randomly disappearing) for a short period of time when I was using my old B450 Tomahawk Max mobo, but then it stopped and it wasn't happening for year until I switched mobos. It also never happened with this B650M-HDV/M.2 mobo while it was the only M.2 drive seated in the upper heatsink slot, so it seems there are 2 different issues I don't understand:
Why is WD SN550 disappearing randomly when seated in the regular M.2 slot with a single screw (both old mobo and current one)?
Why is Lexar NM790 not working at all when seated in the non-heatsink slot?
I also don't know if Lexar is supposed to be this much warmer even though it has a heatsink but that's a minor unrelated issue. I make sure that the screw is tight enough for the drive not to move around at all but I try not to make it too tight.

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ribasmudj Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 12 Jan 2024 Status: Offline Points: 35	Post Options Post Reply Quote ribasmudj Report Post Thanks(0) Quote Reply Topic: M.2 NVMes disappearing and not working at random Posted: 12 Jan 2024 at 8:40pm
	I have an Asrock B650M-HDV/M.2 and I've just gotten another NVMe since the mobo has 2 M.2 slots, so I wanted to expand the storage a bit. The board has a topmost Gen5 slot with a heatsink, and a Gen4 slot under the GPU that's just using one screw to hold the drive. The issue is that the new drive, which is a Gen4 LEXAR 1TB NM790, isn't working at all in the lower slot, and the old drive, WD Blue SN550, works in both, but frequently disconnects when used in the lower Gen4 slot. These are Gen3 and 4 drives so they should both be working in both slots, so I'm not sure why Lexar only works in the upper one or while SN550 disappears when used in the lower slot. Lexar is currently much hotter than the WD drive at 52c idle in the heatsink slot for some reason (not sure if Gen4 generally runs much hotter), while the WD is at 35c in a non-heatsink slot, and lane sharing isn't a thing for this mobo so both drives should work even though I have 4 SATA drives connected as well. I've noticed that SN550 disappears usually after putting the PC to sleep, but it can also happen during normal usage sometimes. Also, the SN550 was having this same issue (randomly disappearing) for a short period of time when I was using my old B450 Tomahawk Max mobo, but then it stopped and it wasn't happening for year until I switched mobos. It also never happened with this B650M-HDV/M.2 mobo while it was the only M.2 drive seated in the upper heatsink slot, so it seems there are 2 different issues I don't understand: Why is WD SN550 disappearing randomly when seated in the regular M.2 slot with a single screw (both old mobo and current one)? Why is Lexar NM790 not working at all when seated in the non-heatsink slot? I also don't know if Lexar is supposed to be this much warmer even though it has a heatsink but that's a minor unrelated issue. I make sure that the screw is tight enough for the drive not to move around at all but I try not to make it too tight.