Hi. Two questions regarding the autopilot use:

1. When in heading bug mode. I change the heading bug to call a new heading. Plane turns to the new heading, but will not roll out early enough so the plane ends up 2- - 30 deg off heading. Then, the autopilot hunts back. Is there a setting to adjust to reduce this error?

2. When in altitude bug mode. The autopilot hold the altitude well. On two occasions over the past couple weeks, the plan starts a climb (once) or a decent (once) from the altitude selected by the bug. In both cases, the plane was tracking the altitude well, then just decides to begin a climb or decent. On one occasion, I noticed that the AP module display was showing a rolling set of lines. I disconnected and then reset the altitude. Is there something I should do in the case? Or a setting?

Thanks