Pixhawk on a boat problem escape to motor

Hi, i have an problem with my boat.
If my battery power from 12v go’s to about 10 volts, one off the 2 brushed motors stopped working. One motor works fine but my boat turns and turns.
What’s in my boat.
1x battery 12volt 10 ampere.
2x brushed motors 12v.
2x esc graupner 40r
V-tail mixer for 2x brushed motors
Some light module.
Fish sonar lucky.
V-tail mixer esc to port 7 and 8, from one esc i disconnect the + red wire.

Any one can help me with this problem?

Maybe use an Ubec or not?

Thanks, jerome

Adjust “low voltage” setting on ESC

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