Thanks for the reply but I'm not overclocking. I wouldn't even know how to.
When I plug my HDMI cable directly in my motherboard bypassing my graphic card I don't get any more crashes, so the problem has something to do with my graphic card.
M12 Bronze Evo Edition 520w ATX12v
Intel Core i5-4590
AMD Radeon r9 290
I did some reading on the forum and I have the impression these crashes may be caused by the lack of power.
For this reason I made this thread in the hope of being helped.
Thank you.