This could be a few things. 1. get the batteries checked, they may say you have a full charge, but when under load, they may drop down to far and fault the controller with a low voltage fault. You could have a bad brake, this can be checked by a tech by plugging in a programmer and checking the fault code. 3. you may have a loose connection and the slightest bump may give you an intermittent power off and fault the chair. Have a Tech look at the chair and see what may be the problem.
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