SDSSDP-064G data dissapearing

Bought 10 pcs of SDSSDP-064G SSDs off eBay 3mnts ago, left it on the shelf and today tried to partition it.
As long as SSD has the power everything is ok, when you disconnect it an reconnect , everything dissapear like from RAM.
any suggestios? cant find anything with google. All 10 drives the same fault - tested on 4 PCs, through SATA to USB and directly as well. Any help appreciated.

I realize this thread is 3 years old but just commenting to say I have the same problem. I assume you never found a solution?

My thread on the topic: Comical failure: SanDisk SDSSDP-064G SSD loses all data at power off, but shows 100% health

Hi. I gave up. Can’t find the solution.