For the first time last night after using the Seestar for about a month, I had this issue. I could not start imaging at all, as I watch the preview screen, the stars would move to the left with each preview refresh. This was after imaging Thor's Helmet for about an hour, capturing about 20 minutes of subs and it performed as usual. I slewed to IC434 which was lower in the sky, and it would not track. I shutdown the unit, and started again. Exactly the same issue, the stars kept moving in the frame with every refresh. I shutdown again, relocated the Seestar to another area and started again. Same issue, so I gave up. I slewed over to the Keyhole Nebula, ETA Carinae, and the Seestar performed perfectly, capturing about 20 minutes of 10 second subs in about 30 minutes. I am not sure what caused the issue. I know the closer to azimuth, the more errors happen, but the Horse Head Nebula was at about 55' N/W when I started imaging.
I had been imaging it the night before with no problems...... Very Strange.....