The solutions is to go to battery click on battery usage. The menu for the 
battery usage page has an optimise battery option. 

Disabling k9 in this list solves the sync problem. At least for me. 

The issue though is it is then checking for mail all through the night wasting 
battery. A nice work around would be alternative polling setting for at night 
but I wouldn't hold my breath for that to be implemented people have been 
asking for the option for ages. 

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