Sounds like my home theater amplifier (Pioneer VSX-921). The audio DSP chip gets too hot during normal use and desolders itself ever so slightly, which gives the error UE22. Someone figured out that taking a hot air gun to the chip fixes it, but I had to re-apply the fix about every three months.
What angered me even more was that Pioneer USA acknowledged the problem and would either repair or give you a replacement model, but Pioneer EU pretends everything is fine and dandy, even when you point them to Pioneer USA its stance.
Usually it's not the chips actually desoldering so much as it is thermal cycling causing the solder joints to crack. Most ICs can't really survive being heated to solder melt temperature for an extended period.
Either way, it's pretty bad that they didn't do something about it. That's indicative of a pretty serious manufacturing or design flaw.
No idea, I gave it away for free to a solder-handy guy who was unemployed and needed something to drive a 5.1 set he was gifted from someone else. I did try a heatsink, but that didn't help noticeably.
What angered me even more was that Pioneer USA acknowledged the problem and would either repair or give you a replacement model, but Pioneer EU pretends everything is fine and dandy, even when you point them to Pioneer USA its stance.