Tm Sopmod Gear box keeps locking HELP

[Tommo c]

Hi looking for help from the collective mind ,I have a new TM Sopmod , was working fine only had two mags through it now the gear box keeps locking , I’m using new 7.4 lipo battery’s which run fine on my other guns , I’m not snatching the trigger I can’t think what it could be .

 

[hunter511]

Semi-auto?

IIRC the gearbox on these doesn't like rapid semi shots. Getting batteries with a higher "C" rating might help.....