Battery and emails

[AC Question]

Yesterday my samsung A3 2016 was upgrade to marsmallow and since then the battery is draining in half time also my emails are not coming in automaticly like before and i must allways update manualy.
Any ideas?
Thanks in advance.

 

[Rukbat]

First clear the cache, then let it stabilize. An update can download a lot in the days after it installs.