I do not claim to be a computer guy, or an expert at much, but I'm kinda knowledgeable about a bunch O' stuff.
I Have seen first hand how goofy receivers can be if they overheat.
It sounds like your receiver did a hard drive reset, but with power problems, you should not expect anything spectacular from a lil' computer that can
make TV from SPACE.........
Can I at least get a little message that says:
"Hi, I'm a computer that uses technology from 1986. Something bad happened that I can't figure out, so I'm calling a do-over. Enjoy replicating all of your settings, wasting a night in the process!"
my two cents is you have exhausted this to the end. I agree with the other members and just count it as a computer glich, which is something we have all experienced and move on....give it a rest!!