I agree with you, there are some issues in Fs2020. I have different issues to yours: When I am airborne after takeoff the A/P always runs off I can't even switch any values, they are always switching back. The aircraft does parabelflights like a Zero-G, at least it catches itself up and doesn't crash. And my ears fall off because of many alarms I can not disengage. And yep, the APU is wway too loud. 😞