Badly tested update. At least on Sony Z1. I use it for few years already. From time to time after an update I am pushed to change the way I used. Similar to M$. They also tell the users how and why and do not listen. App now eat my battery in 8 hours. In the past similar thing happened and I stop using push folders. Now even with pull on 15 min and not more 150 messages the app eat the battery. The confirmation for read all messages is anoing  but I can accept it. Will give it chance for few more days and look for alternatives.
January 01 2017