First did you have your tx turned on before you plugged in your heli? This will cause interference all the time because the rx has nothing telling it what to do. Second interference can happen any where any time and there is little we can do about it. A few ideas to help eliminate problems in the future are 1) dual conversion rx. These rx use two sets of filtering instead of one set of filters. These rx also have more range. 2) make sure your rx antenna is not over lapping itself and in some cases make sure the antenna is completely straighted out or look at a load whip antenna to keep the wire short.

Bevo