Thanks for posting in our forum.
We understand you have few Lenovo* Laptops T460 and there seems to be an issue where the system hard locks or freezes up.
One of our first recommendations always is to update the BIOS on the system, we can see from your post that you did already.
The drivers and OS updates should also be the latest ones, but also it is extremely important to have the SSD in the latest firmware version.
We do understand the drives came with the computer, so these kind of SSDs are OEM, what means that our tools will not fully work with these drives, reason is because the OEM alter some features on the drives and they provide their own firmware and drivers (When applies).
Checking on Lenovo's website, it seems they do provide a firmware update for the SSDs; However, the one you have is not included in the list ( SSDSC2KF256H6L) for some reason.
We do suggest to get in contact with them and ask them if they will be including your current SSD in the list for you to apply the latest firmware version.
Please let us know the outcome.
We are following up and we'd like to know if you require further assistance from us or if you got in contact with Lenovo*. We'll be waiting for your response.
Lenovo took our information. What they will do with it or if they will do anything is up to them at this point as there aren't any firmware fixes currently available for that model yet. We've gone ahead and are replacing affected units with Samsung retail drives.
Thanks for taking the time to let us know.
We understand the situation and we expect they can include the firmware for the OEM version of the 5400s Pro SSD.