Learn and match does not find my remote control.: Other light sources, bright sunlight, Plasma TV is disturbing the IR.
Since IR is light it can be easily disturbed by other light sources resulting in incorrect IR received by the RC9800i. Not commonly known is the fact that Plasma and LCD itself radiate an enourmous ammount of IR.
To solve this you need to shield the path of the IR between the RC9800i and the original remote control. The best mechanism is to put the ends of the remote control in a carton box.