Well if you could get them to give you an new one go for it.
Otherwise what are your GPU temps doing?
If your going to do another RMA I would suggest your PM cl-albert here he can be helpful getting the repair station to actually fix your NB
If NCIX gives you a new Notebook, thoroughly test it right away to insure everything is working.
You can use
Hwinfo64 to see what your GPU load, Temp and fan speeds are doing. Run sensors only or if you open the full program click on the Sensor Tab. Note what your CPU is doing also.
G752VY-DH72 Win 10 Pro
512 GB M.2 Samsung 960 Pro
1 TB Samsung 850 pro 2.5 format
980m GTX 4 GB
32GB DDR 4 Standard RAM
Z97 PRO WiFi I7 4790K
Windows 10 Pro
Z97 -A
Windows 10 Pro