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Power supply possibly. From what I have been recently reading in the EQMOD group any voltage below 12 is suspect. The mount needs a good stable and plenty of amps output to run. The difference between the two motors might be small but enough volts drop difference for one to fail in one position but not the other.
I'd look at trying witha well charged car battery, about 13.6v and check all the plugs and connections.
I use a modified PC supply to run mine and although the red led flashes as it is a true 12v it can deliver the necessary current and doesn't drop voltage under load.
Just an idea.
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