never happened to me before with the 7955tg and sr3300t(though it's for a nitro setup and current is not limited by an ESC)... what's the BEC (Volts and Amp) out of the MMM? the 7955tg draws a lot of current...

you can also set your telemetry to show your rx batt (MMM BEC out) to see if it goes low...the 3300t will work from 3.2 to 9.6V.... i see mine goes down to 3.5v and that's the time to charge my rx batt... don't know if it's the same with esc... wanted to try it but sold my dx3s already....