dc - Fail circuit with N MOSFET, what is wrong?

I have a circuit with two DC power lines coming from BATT A (1A) & BATT B (2A) (two outputs of a power bank). There is a sliding switch on the power line of BATT A. I would like to keep only one switch to control both power lines.

I the following circuit with a N-Channel MOSFET (RFP30N06LE) to be able to control the power line of BATT B using the state of power line of BATT A ?

I have a problem with it, I get 2V on the motor driver when the SW1 is open. Moreover the MOSFET M1 became quite hot.

The goal was to use M1 as switch for BATT B managed by SW1. Do you see any error that can cause my problem ?

Thanks for your help :)