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these are pretty tough units and a major mechanical fault would be fairly unlikely - excess play in the worms and/or imbalance in the load would seem to me to be more likely.
I understand that the mounts keep track of where they are using drive pulse counting - if the motor gets a drive pulse, but is under too much load to respond properly, the mount will thereafter think it is at a position different from reality, so balance and slew rate/acceleration are important to keep the motor load manageable. I presume EQMOD slew rate settings apply under Stellarium and that you can try a less strenous goto slew rate to see if that helps.
Also, if using the Newtonian, check to see that the mirrors are not flopping around, that the focuser slop is not too bad and that the OTA is firmly held by the rings - I think that you recently posted that you get inconsistent star trailing, so maybe movement in the scope could be a contribution?
another thing that you might try is to revert to handset control and see if you can get good goto - that might tell you if you have a mount/scope problem or an EQMOD problem.
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