Recent content by Daniel Marrs-Gant

Sony says "The only way to find out if there is an available Android 6.0 (Marshmallow) update for your Xperia™ M4 Aqua or Xperia™ M4 Aqua Dual is to connect your device to a computer running the Xperia™ Companion application. There will be no notification in your Xperia™ device announcing the...

Its the proximity and auto-brightness sensor, proximity is used for turning the screen off when in a call and turning it on when you move your phone away from your ear.

It does that unfortunately, try closing background apps.