The device goes into Doze mode and kills all connections.
To whitelist an app, on stock Android you use Settings, Battery and then Battery optimization in the overflow (3 dots menu).
We probably can improve the behaviour slightly however. There's some outstanding testing and development to be done.
In Android 7 Doze will occur much more so this is only going to get worse :(
S5 on Sprint with K-9, ever since Marshmallow, K-9 has been nigh-on unusable. IMAP is constantly rolling to syncing disabled - I have disabled the power saving for apps with app power saving set to off (I have also disabled it for K-9 prior) but the damn thing still dozes and kills syncing to IMAP. Making this product unusable. Surely there is a way to change the syncing behavior to force a wake up or something, because at this point, I have to start looking at alternatives to K-9 which sucks because I've used it for blooming EVER. Unless there is something I've not done, would love advise on how to fix this.
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Mike Phillips
Database Support Engineer
ClustrixDB
Knowledge Base: support.clustrix.com
Documentation: docs.clustrix.com