Aha! doing so corrected the problem. Additionally there recently was message of improperly ejected drive but it was internal (An HP 1TB HDD ..far left) that after doing that was not even seen on the system. Id say that one is failing.Can you try to move the EFI folder to the SSD in the optical bay, and see if OC can survive after NVRAM reset?
Most likely the cause of the system freezing up. Would have to test it to be sure its not the fault of the port.
Port ok, but freezing system was not due to that but I think rather (not really topic) RTC battery change.
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