I bought my Acer Predator AG3-605-UR2F exactly one year ago from amazon, I've had no issues with it until now.
About 2 weeks ago, I started playing league and my screen turned into a solid random color but the sound was still there for a few minutes before restarting itself.
Examples: http://bit.ly/2b9UhVm
 http://bit.ly/2bv6OEV
 
I would restart and the problem wouldn't occur for the remainder of the day. However, a week later, I can't play a single game without it crashing. 
It also occasionaly crashes while I'm browsing the internet eg: watching streams, videos, gifs. 
Example: http://bit.ly/2bdFEPh 
 
I imagine this is a problem with my GPU, but I fear it might be my PSU. Can someone advice me what's wrong and what I should do?