I think I have identified one possible cause / solution I hope some of you have the time to test it out too.

Under settings you will find accounts and sync settings. There if I disable Background Data more often than not, my EE comes back from hibernation. when that is active, it never does. If others seem to be finding the same thing, then I can try identifying other causes so that I can make sure it always returns from hibernation, rather than often.
Thanks