Share your experience!
Is it a specific game?
I think you should contact the developers of those specific games that make you trouble.
I was able to duplicate this issue, if you play games or even watch videos and your phone gets hot it will lower the brightness
In this case,it is a security measure.
I believe so, as it happens not just with video games but with videos, browsing etc.
@jkolaric You should contact sony directly:
http://www.sonymobile.com/global-en/support/contact-us/
Alright, thank you all for the info
Anytime