Calvin:

Did you make sure your trims were centered when you did the setup? You could be right on the edge of where there is enough throw with the trim+stick combined. One way to check is two swap the two Rx leads responsible, and see if the MG becomes intermittant. If so, it is 'cause your trim wasn't centered during setup.

Oh... I assume you're using the stick+trims, right? If its gun-buttons, you'd have said so, right? Installing gun-buttons would negate the problem if its the trims.