Response to question #1) no other remotes cause it to come on. In
fact, it will often come back on in the middle of the night with
everything else off. Just sort of ... comes on!

Response to question #2) Don't know about the power spikes/surges,
etc. It's a 110 V unit and its plugged into the normal room circuits.
There is a dedicated 220V used by the prior unit so perhaps I should
have that rewired to 110V to use the dedication.

Any ideas about the part numbers referenced? Would one of these cause
this problem to occur?