Hi all new to this forum. Built quad 250 DIY kit from ebay. Comes with 2204/2300kv motors, emax simone series 12amp esc's, 5045 props, cc3d fc. I built it ran Librepilot connected with usb cable. while upgrading fc usb connects and disconnects also when calibrating. Got to esc high and low then to motor startup initially motor start at 1160's for 2 or 3 and higher for others did 2 flights on 2nd flight #2 esc(ccw) burnt up. replaced with same esc this time motor start 1050's for 3 higher for one(always #3 cw) 2flights again and again esc burnt this time #4 esc(ccw).I am new to quad builds but have been flying fixed wing for 5-6 yrs. have 2 more quads I want to build, since I like flying quads, but don't want to start those builds until this one is figured out. Please help