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Reminds me of a problem I remember hearing about with a TV when I was in college (I started out studying TV/VCR repair). Anyway this guy went in to (I think American) and claimed the TV kept on changing channels by itself (it had a number pad for dialing). Well they opened it up, replaced the number pad etc. and he took it home and it still did it. Turned out the guy lived in the country and his screen door (it was summer time) had a small hole in it. A fly would make its way inside and land on the number pad (changing the channel). lol. Moral: look for the simple things first. It does sound like static electricity or maybe when you put it down you accidentally press on a button or something like that. Is there an improperly shielded power source near where the chair is? An old electronic gadget or something? Electromagnetic fields can I'm sure do some odd things too and I would think would have more effect than static electricity since the unit's case is mostly plastic.
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