Crazy thought but maybe somewhere there is a bad solder joint and when it is cold it shrinks enough to loose contact causing your issues. I won't pretend to be an expert but this seems like a logical deduction. If not at least it rules something out.
Good luck.
Edit, if its relatively new and under warranty, might be worth reaching out to Unicomp. Even if it's not, Unicomp may have seen this before and can point you in the right direction.