Maybe look into the transmitter/receiver battery failsafe function. You didn't mention your radio type; my 9C manual details this on page 43. Any momentary drop for any reason of the receiver voltage (3.8 Vdc for Futaba) will push and hold channel #3 to a predetermined level (default is idle).
ORIGINAL: discusmike
I never needed a extention on channel 3,im running NIMH sanyo 6v-1650mah.Ive never had problems before with this type of battery,is it possible for a battery to send to many volts then go back to working normal again?cause everytime i check them,its seems to me normal.