HP ProDesk 600 Mini G1 desktop, not seeing SSD drives randomly (NO SYSTEM DRIVE ERROR)

[SimmZ]

We have 16x HP ProDesk Mini G1 desktop in the company, all purchased together in August 2015 (still covered by 3y warranty, but it doesn't matter) who are all coming with 500 GB 7200 RPM HDD from the factory. Since they were pretty slow PCs, we decided to upgrade all of them with some high performance ADATA Ultimate SU800 128GB SSD (ASU800SS-128GT-C) about a year ago, 128GB is large enought because we have file servers and PC only have Office 2016 (O365) installed... The overall performance upgrade is monstruous and we are extremely satisfied of the tiny investment ($).

But we have a totally random issue with all of the 16x PCs, were it may happens like once per 2-3 months, where a user simply reboot the computer (soft-reboot, from Windows 10 start menu), then the computer are not seeing the SSD anymore and indicate "NO SYSTEM DRIVE PRESENT" at boot. The fix is extremly simple, the user only have to power OFF the computer and start it again and 100% of the time, it work flawlessly. I first suspected something with the BIOS version, so I updated all my ProDesk to the lastest BIOS from HP... but the problem is still present, very randomly, but still affecting all of the 16x PCs.

It's defenitely not a big issue, but I would like to know if maybe there's a permanent fix for this issue? Maybe it's a BIOS setting who needs to be changed from factory default? PLEASE NOTE that I would not suspect any incompatibility issue with the SSD drive model itself, because on the 16x desktops, I also have 3x of them I had upgraded to SSD earlier using Kingston and Crucial SSD drives and who have SAME ISSUE. So only 13x of my ProDesk have the ADATA SSD but all 16x are affected.

Thank you very much.