I have been using the ASIAIR Plus with the ASI 2600M camera, EFS, SASI 1200 guide scope, and AM5 mount for about a year and have had no significant issues. Suddenly, my tracking has been going off the rails, resulting in ruined subs. The problem is intermittant and I have checked for wire hangs and everything else I can think of. attaching a screen shot. The red and blue lines converge from time to time only to separate in opposite directions. 
Any idea what is happening here?
