So you are in the stock rom, this is usually from google, try to deactivate the sync of contacts and calls in Google's configuration, that was solved the problem of my young brother.Nope. Unticked. This is drained by google call log back up/restore procees running under android core apps. Funnily enough the process is not even running and still draining battery.
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Somebody know of I can install the getapps store from xiaomi?