Thanks for your response.
Whats the best way to send the files as I can't paste them in here?
Regarding running other programmes...
Only FSX related - scenery, airports, that sort of thing. I turn off AV, mail etc before starting up FSX.
Interestingly, these "hang ups" normally occur when in cruise when you'd think the least amount of activity was going on.
This was occurring before I installed Aivlasoft, but it seems the extra memory draw might be making it happen more frequently and certainly closing EFB seems to speed up restart.
Rgds
Mike