Guild Wars 2

Hi I’m having a slight problem and thought maybe someone could help me:

I recently decided to start playing Guild Wars 2 again. Now my Problem is that I can play the game for about 30-60 min and then my Laptop just turns itself off, no bluescreen nothing it just shuts itself down.

My Specs are:

Intel Core i7-4700MQ CPU@ 2.4 GHz
16GB RAM

I have an Onbaord Intel HD Graphics 4600 and an AMD Radeon R7 M265 second Graphic Card

OS is Windows 8.1

Now I played the game fine about 7 Months ago without it crashing it has seriously just started doing this!

I can play other games like Battlefield, Titanfall, The Evil Within and Skyrim and other MMO’s on pretty good settings (Medium to High) and they don’t make my Laptop shut down!

Could it seriously be that Guild Wars 2 makes my PC overheat to such an extent while games that theoretically require more e.g. Battlefield 4 don’t? Or could the Problem have another source? Has anyone else had a problem like this or similar? Would be happy to get a bit of feedback on how to solve this!

Thanks and Best Regards!