well, i'm 100% sure that it is not the remote or keys on tv. Basically, those are fine, because i've been using it for a couple of days withou batteries in the remote ... So, it's smth different.
Now, new info was discovered, that if tv is turned on and off for a number of times, then the problem is gone until it is turned off again. Any comments about this?
Also, if the problem is temporarily fixed with "on/off" solution, then it might start playing with channels again after few hours of work.