If the supplied voltage falls too low this will happen. Had the same problem with mine when I let the 12v battery discharge too much. The mount will draw ~2 amps when slewing, if the power supply is not rated for this or more it will drop the voltage below the critical level (seems to be around 11v). Same with a faulty/low charge battery. Pretty sure there's a warning on Andrews site (?) re the Synta systems not being built to tolerate unregulated supplies.
Bill
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