Thanks guys. I got the module from Adrian when I switched over to electronic advance. It's the right one. I ordered some five cell 2100 mah NiNH ignition packs from NOBS Batteries. My four cell packs were two years old. The problem showed up after the first hour of flying with 1400mah Nicads. They should have had enough capacity and always cycled well. The slight drop in voltage could have caused the problem. Maybe the new packs will do the trick. Dan.