Autopilot switches off in outside aircraft view

[Speed1994]

Hi, there’s a known bug that sounds very similar to this:

Autopilot not working properly in External View

Since installing the beta, I have found the above problem with multiple aircraft. In the external view, which I frequently use on sight-seeing bush trips, the aircraft does not follow changes of course but flies straight on past the waypoint. It also drifts off the set heading, and randomly gains or loses altitude. It is erratic and does not happen at every single waypoint or change of course, but it does happen frequently. This happens on both standard game bush trips and those from 3rd partie…

And another user posted a possible workaround in the thread:

Autopilot not working properly in External View

A workaround I have found is to open the MFD display as an external window (Alt-GR + click on MFD display). Having the MFD visible (either from cockpit view or as an external window) seems to cure the AP inability (in 1.33.8.0) to maintain the course (esp when it changes) and VNAV limits. The External MFD window can be resized (Edit: or minimized) and placed somewhere that is not obtrusive. If you close the external mfd window, the AP issues come back.

Hopefully this helps with your issue