Devo 12s memory loss

Hi guys, I bought Devo 12S and I flashed deviation 5.0.0 everything went well, I copied my old models from Devo 10 and bound with my models..
But I turned on and off my tx and thee times the usb logo came on the screen and I lost all files in devo's memory.
When I plugged it to pc, the drive should be formatted it said.

I tried to reflash deviation again but it still presists.
Do you think that my tx has memory corrupted?

Have you formatted the memory?

Yeah, that's for sure. In case I didnt format the memory, it wouldnt be possible to copy needed files there.
But after few turn-on and off the TX, the memory got lost and I had to format it again...

Do you use Quick-Format or Standard? I had a Devo 8s (now 12s) and i remember this problem with my 8s. But i use the standard option to format the drive. After that i never had this problem again.

I formatted it in both ways - Quick and then also Standard. Now I flashed fw 4.0.1 and selectt Standard formatting method of memory.
Everything seems to be OK now.
Later I will flash fw 5.0.0 and will test it again.