Q 10 became extremely slow in responding after update to 10.2.1.537 - battery draining very fast since, too

Hi,
my Q10 now got very slow after the  update to 10.2.1.537 
It takes ages for switching from e.g. text to E-Mail Inboxes, from Hub to oriority Hub view or just to opening an email or an app.  Also, it s draining the batterry very fast. Down to 20% after only 3 hrs , and than it is switching off. Even in Aircraft mode the battery is down after 5 hrs without me even touching the device.
Any clue what went wrong? 

I am also experiencing all kinds of problems since the 10.2.1.537 upgrade. I now have to reboot my Q10 constantly as it will just freeze intermittently! After making a call I sometimes have to wait 5 minutes+ untill I can make another call. My battery also drains very fast - I have to charge it everyday.

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