Did you have a fix by the time? My same 256 GB Ultra Plus has began to have the same behaviour since a few days ago.
SSD ran well since a few months, nothing changed (except Ubuntu upgrade a few weeks ago, that permanently fixed a ‘black screen at wake up one time out of two’, and worked well), and since one week a black screen on boot time or resume from sleep.
SSD is then not recognized in BIOS (asrock 990fx extreme3).