had similar sounding problem with my HEQ5pro. turned out to be the cable between the controller and the mount - intermittent open circuit somewhere in wire or connector and depended on mechanical stress on the cable (ie would sometimes drop out when slewing). Replaced with a fairly flexible standard cat5 cable and the problem went away. Of course, I carefully checked that connections were the same before plugging in (at least those that were not open circuit). could be worth checking. good luck
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