As I mentioned in my earlier post; this topic has been covered many times and there is no simple answer.
This topic has a poll which is probably the best way to gauge where you are in respect of issues with the sim
The Community Team have asked us to reduce the incidence of duplicated topics and close them when necessary. The Community Team along with members of the developers do try and follow as many topics as possible but will tend to concentrate on the well established ones otherwise they are spread too thin.
I am therefore going to close this topic now and thank you for your contributions and understanding