i have an old world engines expert radio that i am using on my trainer. last time i used it (3 years ago) it was fine, no glitches, interfereance, ect. i put new batteries in the rx and tx this morning, hook it all up, and now it is glitching and wont work properly. what is the most common cause for this kind of thing? i realy want to fly this thing again, and have to get it sorted by next weekend. any help would be much appreciated. thanks