Random crashes with AMD R7270x

[Mobby Dick]

Hey guys, 

so I built a PC for my dad two moths ago with the following specs:

 

i5 6400

MSI b150m mobo

Corsair vs650 (used)

R7 270x (used)

Corsair 100r with an additional fan

The rest should not be of any importance for the problem.

All the used parts were used by my brother or me before, so they are perfectly fine.

 

Everything worked fine for two months, but after a recent driver update (unfortunately my dad does not remember what exactly has been updated) Star Wars Battlefront keeps crashing randomly. Sometimes after 2 minutes, sometimes after 2 hours of playing. The rest of his PC keeps working and when he shuts down the game in the task manager, everything goes back to normal. He always gets the following crash report(that I have never seen before):

 

Updating and reinstalling the drivers of the graphics card didn't work...

Do I have to reinstall directx? Is that even possible?

 

A little note (might be useless information, but maybe it's important): HWMonitor displays the card as a R9 370, even though every other application says it is a 200-series card. It is most likely because of HWMonitor, but who knows.

 

If you have any ideas, let me know. I really have no idea what to do...

Already thanks to you guys