K-9 mail drains battery?

Samsung Galaxy S5
Android 6

I have been using K-9 mail for a long time and never had much problem. However, about a month ago, it starts to drain battery. When it happens, there will be no email received until I stop and restart the application. It appears to be stuck in some active loop and keep running in the background, probably attempting to get email but could not.

Has anyone had similar problem?

Thanks

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