So I was flying my drone and took a pretty hard crash and my front right motor stopped working. I figured it was the esc so I switched it but had a problem. I shorted the esc by putting the terminals wrong so it made a spark and everything. I bought a new esc again and hooked it up right programmed it and everything. I took it for a fly and it was fine until i plugged my 4s pack in. After that the same motor failed. So i fixed that and it flew again but i did a roll and it totally flipped out in the air. Now a different motor stopped spinning. I dont understand i was flying it and it randomly stopped. Maybe i broke my pdb due to the short? But different motoros are cutting out.
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I would guess your ESCs may be underrated for either the current you're drawing and/or the voltage of your battery.
Re-check the ratings of your components to be certain everything is rated to handle 4S (16V) and not just 3S (12V).