I have the newer gold ignition module on a 80J, it seems to be failing much like yours. After 10 minute flight the engine just quits, I burned 5 gallons of 32 to 1 break-in mix and was in the process of switching to 40 to 1 fuel when the problem began, the engine is new while I've owned it for several years. Was purchased from RCS before they closed their doors. I'm using the Epower switch. I did a wiggle test on the wiring with engine on and found no problem. The battery is a 6 volt 1650 NiMh that tested at 6.5 volts with a 1 amp load following a deadstick landing. I decided to replace the switch but discovered Epower is no more. I find that odd because Michal Janousek was the point of contact for both Epower and ZDZ engines.
I bought a Cermark switch to try but decided to replace both the switch and ignition. I'm installing an Rcexl unit rather than mess around with another ZDZ ignition. I own three 80's, 1 RV and 2 J's, each one has a different ignition module? I guess they never got it right! With the current price at $499, I can only wonder how much longer ZDZ will be around. To be honest, I think it's a very good buy at $499.