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my EQ8 does this if the dec is too well balanced - I put it down to the gear/worm losing physical contact if wind etc should drive the axis into the backlash region. If the gear and worm are not in physical contact, phd2 cannot do anything to control the axis - it keeps applying corrections but nothing happens and then it eventually takes up the slack and over-corrects. Deliberate imbalance seems to do the job for my mount and since the gearing needs some backlash to work properly, I have not tried to tighten it up. spring loaded worms would be nice.
I use remote desktop as well - my understanding is that everything still runs on the remote machine, so I can't see how that software would cause such a problem.
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