I started a build - 450 eBay DJI clone- frame DJI 2212 920 kv motors Emax 30a SimonK motors with bec. Naze32 AFRO FC 6DOF Bench testing with a 1500mah 11.1v 40c 3 cell Lipo. Testing in the garden went badly! Power up slowly just as its lifting.... it flips 360 to the right before I could shut it down. I run it through Clearflight, checked the receiver is OK and motors. Re-calibrated the ESC using the Clearflight motors section. Before and after that - checked each ESC with the Emax programmer card - all OK all matching settings. Moved props around just in case although they are DJI props and well balanced. Back in the garden, - I thought maybe I was too slow lifting off and should apply more power to jerk it up. It just sent a bit higher and faster in a not to grazeful 360 flip - to the right. Back on the bench - I ran it through Clearflight again.. no props on naturally - everything seemed OK. Pigged off, I took out the USB cable and picked the frame up to remove the battery. This I did by grabbing the front right arm... fingers around the ESC... which was quite warm. I checked the others..cold. I put a small fan on the ESC to cool it off.. then ran the motor's - within 30 seconds - it was getting warm. The others still cold. Running the motors in Clearflight - all shown to spin at the same speed. With props on running up power.. they all seem to sound the same and run at the same speed to a point where it seems to surge - then the flip happens. The obvious solution is to change the ESC.. but I dont have any spares and reluctant to strip one from another completed build - add to that China is closed for NY! I would also like to know why the ESC is getting warm or any tests I can do without having a lab full of testing gear.