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Maybe check the dec tracking mode in phd if you have not already done so. it can be set up to track either north or south only and if it happens to be set up to track opposite to the way your star is drifting, it will not track at all. Try it with either north or south setting and see what happens. If it is set up incorrectly, the dec error will continue to increase until the star drifts too far and phd gives up.
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