No maps are complete gone, it looks like this NVMe can not holt its data.
I have 3 other disk, 2 SSD both 256Gb , that both contain the OS, one for gaming, the other one for regular activities like interneting, and one 500Gb HD, for data. On all 3 disk I never had any data loss.
MBAM and MS virusscan both the most intense scanning, did not detect any trojan, maleware or virus.
Couple of weeks ago I did restore the data on the NVMe and use my PC 3 days friday, saturday and sunday, no data loss and after one week non activities it did have data loss again. Interesting points, not quite sure but it appears, mostly the lost files are the last one that I put on the NVMe.
On the NVMe I have installed data, Steam, AssettoCorsa, racefactor2 and SteamVR. Steam is btw always updating also strange.