I had a 1tb of these crap out after 9 months of use. Same as op, turned the pc on and it wasn’t detected. No warning sign of a failure. They were quick to replace it with a new one.
I ran a similar setup for my knee. Works great but you have to keep replacing the ice. What you need to do is mod it with that chiller Intel used. No need to change the ice and you’ll stay cool all day.