Did you try whether Samsung Disk Magician health status gave any clues?
Sorry, something lost in translation. I will try again. With empty I intended that Disk Magician does not format the whole disk but keeps a portion in reserve to use when solid state memory decreases. It is an option of Samsung Disk Magician. I looked it up and it is called " over provisioning"Oh yes. Checked the health and for bad blocks. 99% health via HWiNFO and Crystal Disk Info and 0 disk errors via Magician. A corrupted recovery partition, I'm thinking. The disk was already mostly empty also.
But Disk Management had said all partitions were "healthy." Very strange but I'm over it.
Not sure how I feel about once open-source software becoming a pay for use app with various tiers where certain features are only available for the xxx amount of money you pay.