Xperia Z3 :: Phone Screen Continually Blanking Out

I was half way through writing a text message the other night and my screen had what could only be reffered to as a brown screen of death. I force restarted the phone and the Sony logo would start up before it went straight to a black screen. I could tell there was a back light behind it though. Eventually after turning it off and on about four times it started normally and I didn't have any further problems... for 24hrs.
 
When my alarm went off this morning I had the same screen of death and was only able to turn off my alarm by force restarting my phone. Now when i restart my phone I can usually get it to turn all the way on but then it randomly 'blanks out' after a few seconds. When this happens I can continually press the power button to get me back to my lock screen. Sometimes the screen will stay active long enough for me to unlock the phone, occassionally long enough to even read or write a message, but always, whether it be after 1 second or 20, it eventually blanks out where I can eventually start from the unlock screen after continually pressing the power button.
 
In a word, it's infuriating. I have already had to deal with two broken screens with this phone (both whilst just sitting in my pocket) that have cost about $350 each to fix and now this. I am definitely never going to buy Sony again however I need this phone to last until the end of my contract.