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I had a few wierd glitches of a similar nature at astrofest, guiding would be fine for quite a while and suddenly the guide star jumps almost out of the box and continues to move (I assume the SSAG was still moving the scope). The guide star finally settles. It's as though PHD suddenly decides to send a bunch of unnecessary guide pulses. Alignment was good and drift without guiding negligible. I did notice that when slewing, the video often had noticeable noise, changing the guide cable to one with twisted pairs rather than flat eliminated most (but not all) of that problem. I think h0ughy had similar guiding problems with his Lodestar and PHD, often I heard Dave cursing his guider in the dark, only to look and find I was experiencing the same issue.
My first thought was a synscan firmware issue, but given that others seem to be having problems maybe it's PHD.
My version of PHD was 1.14.0
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