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Looking at your image, I wonder if you have focused your guide scope properly? The very bright star at the top looks to be too large and the other fainter stars seem to be quite fuzzy. PHD probably needs to have a very small point on which to guide. For that reason I usually select a guide star midway between the brightest available and the dimmest. If you are guiding on a large and/or de-focused star PHD will have a hard time determining if and when to send an adjustment instruction to the mount. Once properly focused and unless demounted between imaging sessions the Orion Miniguider / Autoguider should hold its focus setting well.
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