Well, one of the problems I am having is that the aircraft has been a real bear to hand fly, like it is too light etc. so I thought that this might be why.

However, I have discovered with this power running out problem, the so called "APU problem" which is nothing to do with the APU as it happens if ground power or the APU is on, if you reload the aircraft from a saved flight after this happens, as I did so as not to have to re-enter everything from scratch again, the aircraft only gets loaded up with 5,000 lbs of payload!  Didn't catch this the first few times around.  

You know you have this problem when the bank angle indicator suddenly starts to slowly rotate towards a 45 degree bank angle, for me usually just as I am pushing back >:(.  When this happens you know you are cooked, you can't start the engines, APU shuts itself off and an aircraft or saved flight reload is the only solution.

This loss of electrical power really is an insidous and hateful problem  ;D.  I hope this gets fixed right away.

Note to CS:

Fix the loads not loading correctly when loading a saved flight and/or reloading the same aircraft.

Of course, it could just be me :-?