Q: Macbook pro retina 13" late 2012 randomly crashing OS X and showing artifacts/graphic glitches

Hello communitie!

I'm having a problem that's been driving me crazy and doesn't let me work as I wish.

Since I installed OS X 10.10.3 update on my Macbook Pro 13" Retina (Late 2012) I'm having randomly (or maybe when my computer it's on heavy use, I'm not so sure...) these artifacts or graphic glitches appearing on the screen and also they appear when I use my external monitor connected thru HDMI. I think it has connection when the computer gets hot for heavy use, and sometimes OS X crashes.

I thought it could be an error on 10.10.3, but now with 10.10.4 I still have this problem on my laptop.

Picture of graphic glitch / artifact attached.

Does anybody know what can I do or have a recommendation? Would it be recommendable to reinstall OS X or do it have to be worried for hardware issues?

Thanks in advice!