Hi Lewis, what SynScan software version are you running?
I'm not using a guider but I had some Dec oddity with the latest version (3.32). Using goto to slew to an object the mount would go there with good accuracy, then move away in Dec by a good half degree or so, move back to the object, move away again etc, a few times. It would eventually stop away from the object rather than on it.
Downgrading to version 3.27 fixed this.
Cheers
Steffen.
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