SSD or motherboard issue?

These past few months my Samsung 4TB 990 Pro SSD has been unresponsive twice already when installed in the 2nd M.2 slot of my motherboard. First time I was using come sort of GUI-based Robo Copy program to copy files to it and the program came up with an error coping message about 90% of the way through the copy process and quit the copying process. Another time I was playing Flight Simulator 2024 and about 2 minutes after take-off there was extreme stuttering and then the game froze on my and about 10 seconds later I got kicked out to the Windows 11 desktop interface. The game was installed on that SSD that was installed in that M.2 slot. Windows 11 was installed on the first M.2 slot on another Samsung 4TB 990 Pro. I then clicked on several program executable files that were stored on the 2nd 4TB 990 Pro and they were inaccessible and the icons changed to just a picture of blank sheet instead of the original icon showing next to the executable files. I checked event viewer...

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