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I have also had times where the guider will suddenly give a big correction. This is using both PHD and CCDSoft for guideing.
It is usually when I'm also doing other things on the computer.
I have noted that occasionally I will get interference lines on the guide image or a cosmic ray hit. The interference happens when the puter processor is busy. This tricks the guider into thinking that the guide star is not where it actually is and gives a big kick to the mount. it then over corrects back the other way as you see on your graph.
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