Hi Roger
Couple of things, what Level Gemini do you have. Prior to Level 3 Version 1.13 there were problems with PAC, it was southern hemishere specific and would send your correction in the wrong direction. This was supposed to have been fixed in Level 3, Version 1.13.
I am asuming you have done this as you are experienced in using a Gemini. Have you checked your cables, no obvious faults. How is the 2032 battery, if it has been in the unit for more than 12 months it should be changed, a lot of problems can be traced back to this. Do you have the Gemini in Photo or All Speeds Mode when using the autoguider. How is your power supply, is the Gemini getting enough power.
I know these are the basics and you have probably already eliminated them but it is a start point.
Cheers
JohnG
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