M.2 SSD detection issue

[Sharku]

so i installed an NVMESSD (WD Black SN850X) in my MSI B450 Tomahawk Max which does not support PCIE Gen4, i have installed the SSD correctly, my bios is up to date, the ssd is working but maybe after a day or two when i turn the pc on it does not show neither on windows nor on Bios, if i open and reattach the ssd it shows up again, i have checked with crystal disk info and even bios's built in m.2 checker, both shows that the SSD is new and no errors there, the other day i did not even have to open up the ssd and its back to showing, from bios i just changed storage to raid and turned it on to a blue screen and after reversing it to as it was the SSD was back and now my other sata storage devices were not showing in the bios, one of which contained window, but getting out of bios the pc booted up in windows and was showing all the devices including problematic SSD, do u think it is the issue of the motherboard? the SSD itself? or Bios? 

[191x7]

1 hour ago, Sharku said:

so i installed an NVMESSD (WD Black SN850X) in my MSI B450 Tomahawk Max which does not support PCIE Gen4, i have installed the SSD correctly, my bios is up to date, the ssd is working but maybe after a day or two when i turn the pc on it does not show neither on windows nor on Bios, if i open and reattach the ssd it shows up again, i have checked with crystal disk info and even bios's built in m.2 checker, both shows that the SSD is new and no errors there, the other day i did not even have to open up the ssd and its back to showing, from bios i just changed storage to raid and turned it on to a blue screen and after reversing it to as it was the SSD was back and now my other sata storage devices were not showing in the bios, one of which contained window, but getting out of bios the pc booted up in windows and was showing all the devices including problematic SSD, do u think it is the issue of the motherboard? the SSD itself? or Bios? 

Replace the CMOS battery. If you have a multimeter, test the voltage of the battery and replace if it's low.

[kokosnh]

„SATA5 and SATA6 ports will be unavailable when installing a M.2 device in M.2 slot.”