Hello everyone.  First - this is my first post, and this weekend (including today) marks my first flight(s)! I'm thrilled, and having fun (mostly).  Here's my first ever flight:  (then my question) Now, my question: It would seem that every time the main battery gets low (I'm running two - one for AMP2 & receiver, and 4S for ESCs/motors) one of the props quits sending the copter into a death…