Some things to ponder:
I am no electrician but by adding two circuit breakers in parallel you are doing the same as adding a higher rated circuit breaker?
The lower the voltage the higher the amperage. So if the batteries can't hold there voltage the amperage usage will go up tripping the circuit breaker.
Bad connections will cause a voltage drop and increase the amperage. You have to take into consideration both the positive side and the negative side of the complete system. Most electrical problems are connection problems.
If you have a hydraulic valve that does not completely open that will increase the system pressure causing the motor to work harder consuming more amps.
Undersized wire will cause more resistance and amp draw.
Low fluid level in the reservoir would stop the motion until it received more oil to push the cylinders out farther.
Happily my slides work fine so far! (knocking on wood!)
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