Anyone else get a system update 10 Aug 2015?

Received notification of a system update today, 10 August 2015. I'm a little leery of installing this. I'm at 5.1.1 and after installing 5.1.1, I have the dreaded unannounced deaths where the phone will turn itself at random. Sometimes it will reboot if you hold the power button down for about 15 seconds. Sometimes the charger needs to be plugged in before it will reboot. Sometimes it cycles through all apps before completing the reboot. Sometimes not. If the new update will fix this, I'm all for it. But, I don't want to get fooled again with these updates. So, anyone else get an update? What does it do? Any problems after the update? Thanks.