motor shield current crossover possible?

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hey everyone.  having problem motor shield.  code works great, there seems problem current bleeding between 2 sets of motors.  got set of vibrating motors , 1 basic dc motor.  have vibrating motors pulsing every second , dc motor staying on constantly.  problem seems when break activated vibrating motors them pulse, dc motor pulses.  doesn't stop completely, stop noticeable.  know of way stop other motor stopping?  checked current draw @ 1.35 amps, calculated, , shield should functional 2 amps. 

when code or that, motors strange things. and, yet posting code didn't seem occur you. hmmm...


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