Yep ...
Pull the pill out ... Check to see if it runs correctly outside the body .
If not , check very carefully for a short ..
Its a process of elimination ..
Do you have a Multimeter ? Check current draw @ the tail
If its a Q5 it should draw around 700Ma to just over 1A measured at the tail .
Anymore [ 1.5A + ] and you need to check for that short .