I have something very strange to report.
I have three pairs of dashcams using Vico Power Plus power supply, with a double 12V adapter.
I have a pair of SG9665GC V2 front and rear running Sandisk 200 GB micro SD cards, and this pair is fine.
I have a S9665GC V3 front and SGZC12RC V3 rear both using Sandisk 200 GB micro SD cards too, and this pair of dash cams is fine too.
However, I also have another pair of SG9665GC V3's for front and rear running Sandisk 200 GB micro SD cards, and these two continually reformat themselves!
Presently, I spent a few weeks testing with their original Transcend 32 GB micro SD cards, and they have been fine.
I will try to test the Sandisk 200 GB micro SD cards on the pair of V3's again.
Really strange what's going on...