To isolate/resolve the issue follow below mentioned troubleshooting:

Clean Air vents:

1. Check the vents on the computer to see if they are covered with dust and not allowing heat and air to pass through.
2. Use a compressed air can to blow the dust out of the vents. Be sure to hold the can at an upright (near 90 degree angle) and hold it 15-20 centimeters (6-8 inches) away from the target.
3. Turn off the System
4. Remove all power sources: Unplug the AC Adapter and Remove the Battery, or Unplug the Desktop Power Cord.

Hardware Diagnostics Check:

Run diagnostics on the computer (restart the computer by holding FN and Power button simultaneously) let the diagnostics complete.

For more information refer below link link:

http://dell.to/ZH1RKc

Interestingly enough, I've had the same issue with one I just bought.

This thing is basically totally untouched. I completely updated the PC, Windows, drivers, firmware but otherwise just installed a few games to test.

This is also my second PC, the first one had bad pixels, and this second one does too. Unbelievable.

I can't even say how disappointed I am buying this "premium product"

Hi @Ro47 welcome to this user to user discussion forum. This is not Dell Support. 

You have the first 30 days on approval timescale to determine if the very expensive laptop has any faults. Your laptop has a fault(s) and it should be Rejected. Use your online dell account to ask Dell to create a Service Request for you. Be clear what remedy you want, new replacement m17 R4 or full refund. Your existing first year Dell Warranty will remain active if requesting a new replacement, and after 30 days you may still not have a new replacement. Dell Refund policy, New vs Refurbished.  

Please click on Kudos to say thank you for response from user that is not employed by Dell. Please share an update on progress, so that other users derive benefit from your experience. Thank you.