I had problems with dropping out of auto level when setting up bombing and heard others have same problem last night.
What I discovered was that when you go to bombsight mode it should activate autolevel automatically so if you have put it into autolevel then went to bomb sight it confuses things.
I have done a brief check and the solution I have found is go to bomb mode then switch straight back to normal and check autolevel has activated , if not toggle bombsight until it does. Once confirmed in autolevel (by just using the bombsight key) I have not had any problems.
I can make adjustments and toggle back to normal view to view map then back to bombsight without issue