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If you normally have decent autoguiding and all of a sudden it goes bad I usually check cable drag. Cables can be pulling on the rig in some angles.
First thing though I would simply try another guide star to see if that made any difference.
You can also fiddle with the guide rates on the RA and Dec to compensate.
You also know of course when you cross the meridian you have to check the reverse X button? If you start autoguiding and the RA errors start climbing fast you need to check the reverse the RA commands because north is now south or vice versa. In other words the correction going to the mount in RA is correcting the wrong way.
Greg.
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