Hi, i have a H680 Quad, setup is as follows: x4 NTM 2830 800KV Motors, x4 30a ESCs (latest simon k sw) Naza M Lite, Spektrum ar8000, Running 4S 14 Volt, Props are 9 x 3.8, The Quad flies great, nice & stable and can fly for 13 mins, but after 5-7 mins the 2 CW Motors are stone cold, but the 2 which are turning CCW are Hot ??? why can this be when the same load is on all 4 motors, all components are as new with only about 40 mins use. any thoughts or suggestions would be appreciated.