I think the problem is in combination of 30V MOSFET`s (QN3109), 6S battery and low-Kv motors. In situation with static thrust (on stand) all works perfect, but when you try sharp acceleration- deceleration commands, voltage spikes may be very high. I have registered spikes up to 36V using 35A Bumpbee-s and 300 Kv motor until magic smoke came down. Adding additional low-ESR caps and maybe TVS diodes should solve the problem, but further testing needed.
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