Hello everyone!
The small drop-down arrow that shows near the volume bar is a bit too glitchy sometimes, sometimes I just can't see it, and sometimes it overlaps the volume bar itself in landscape mode.
It gets fixed by itself or by restarting the device but it's a bit too annoying.

I had this problem since Android lollipop till now on 6.0.1. i wish someone can forward it to the Xperia team so it'd get fixed in the future updates. Take a look at the pic for more details.
Thanks!