Chuck: I'm going by the meters on the ZW-L. I do not have a separate ammeter.
Lee: Are you running in command mode? The problem only occurs if the ZW-L is set to full voltage and you are running a pulmor motor and the amp reading on the ZW-L is around 6. Can motors do not cause any problems.
I have the ZW-L set for command operation. All four handles are set to max voltage. I power up the ZW-L using the legacy remote. I address track 1 and turn the red knob until the voltage meter reads max on the ZW-L. Speed steps for the ZW-L is set to 200 for all 4 channels.
My train room has a dedicated line from the Circuit Box - 20 amp breaker, 12 gauge wire to the outlet, powering the outlet. Nothing else is on the circuit. The ZW-L does go through a power strip. I tried plugging directly into the outlet and it had no effect.