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While I don't have an EQ6 it does sound as though the mount has slewed to its maximum amount but doesn't realise it. The bouncing has me concerned, it's sounds like the worm shaft is continuing to drive on the worm gear and then when tension gets too much, the two gears slip apart until they can reseat again after the tension has been removed. The controller will think that the mount has continued to slew but has become misaligned by the amount the gears have slipped. (and the goto after seems to confirm this)
This is not good for a number of reasons. The least being lose of alignment. When the gears slip you will have the teeth from both the worm drive and the worm gear sliding across each other. This will in time cause damage to the teeth of the gears. It puts excessive strain on your motors as they are trying to drive the mount past a no go point. Eventually you will start to get a worsening of your periodic error and an increase in non-periodic errors.
Does it look like the mount should be able to slew further with the motors? If you loosen the clutches can you move the mount past the points it reaches with the motors. You should be able to move the mount further with clutches disengaged because you have bypassed the software safetys.
Can you check to see what the mount limits are in RA and Dec?
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