Alienware Area-51 R2  

I bought my alienware desktop 3 weeks ago for £2500. For 1 week, I didn't have any problems and then my problem is started within the 2nd week and still I have this problem. I reported this issue to dell support at 3rd week ( and I still wait their answer ) after I returned to computer to its factory settings to fix this problem but nothing changed. Thus, I wanted to get some help and support from forum if you know how to fix this issue :(.

My problem is " When I open any kind of program or when I play any kind of game after a certain of time like 30 minutes sth generally  my computer totally freeze and even the keyboard is not working which makes me to shut down the all computer from power supply button... then I try to re-open the computer and only alienware emblem with loading appears without any respond + keyboard become in offline mode too. After 2-3 tries I can reopen the computer but the freezing issue still continues. I checked this issue on the google and it seems most of alienware users with windows 10 pro experienced it. I cannot find any solution how to fix it. Is the Dell ( Alienware ) sent me a broken desktop or what that I paid £2500 to experience this issue starting with the 2nd week !!! It seems this issue is random and started to be a certain problem because I even cannot use my python, arduino, eclipse, or play any kind of games in long term anymore and I am really *** off now. This is my only computer right now and I am doing my master degree on artifcial intelligence and robotics in England too. Shortly, I work on computers so much too. If dell sent me a defective desktop why I paid £2500 for it.... When you send your computer to repair it doesn't come for a long time too !!!!!

Is there anyone would help me to fix this problem in my computer please ? I run the dell diagnostic test too and it says there is no problem with your computer. But then why am I experiencing this issue now ? 

Note:

Do you know why I bought a desktop this time ? Because I was using alienware 18 laptop for +3 years which is not even producing anymore and this laptop served me very nice too which I didn't experience any of these problem I encountered with my current alienware desktop... But my laptop's dual graphic card is burned and thy said me it will be costed too much and the repair will take a long time because it is an old alienware laptop model ( but I was paid the same amount for my laptop 3 years ago like my current desktop, and it was the best laptop too at that time anyway ) so this time I decided to buy a desktop but I have this problem already!!! 

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