I seem to have a similar issue:
- Moto E 2nd generation, Android 5.0.2
- K9 5.007 running fine, with push auto-sync working both on WiFi and 
mobile data
- K9 set up to perform Background Sync only when Auto-sync (Android 
setting) is checked

Whenever the Battery Saver activates (triggered both manually or by low 
battery level), auto-sync is deactivated in K9, which is the expected 
behaviour.

However K9 will not resume auto-sync after the phone is plugged and the 
Battery Saver deactivates. K9 remains stuck in "Sync disabled" status.

To reactivate synchronisation I need to close and reopen K9. This is 100% 
reproductible on my mobile.

Any idea whether this is a bug or a feature?

Am Montag, 25. Januar 2016 14:13:37 UTC+1 schrieb Richard:
>
>
>
> > Date: Monday, January 25, 2016 00:42:38 -0800 
> > From: John Thorp <[email protected] <javascript:>> 
> > 
> > SOLVED - Richard thanks for your contribution it has solved my 
> > problem and syncing now keeps going when on battery power as it 
> > did previously. Not sure why this problem started after running K9 
> > for a long time without the issue, but I suspect an update of K9, 
> > or maybe the Android O/S, reset the battery saving element of K9. 
> > Thanks again. 
> > For others, what Richard suggested was resetting the battery 
> > optimisation for K9  You can get to this by: 
> >      - [android system] settings 
> >       - battery 
> >        - vertical dots (upper right) 
> >           -- select battery optimization 
> >         - "not optimized" pulldown 
> >             -- select "all apps" 
> >          - scroll down/select K-9 
> >           - set to "don't optimize" 
> >   
>
> Glad that fixed the issue for you. 
>
> With Android-6 a "device/app sleep" (don't remember what it's 
> officially called) capability was introduced -- to help preserve 
> battery life. That's what the app "optimize/don't optimize" setting 
> is addressing/overriding. 
>
> If you are seeing this issue on pre-Android-6 devices (there is at 
> least one report of that that I spotted) then you have something 
> else going on. 
>
>
>

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