Based on the information you gave us it is hard to tell for sure what might be the reason why the PC is getting freeze, could be a problem related to motherboard, processor, memory RAM or even the hard drive.
Normally what we recommend in this situation when you use a desktop PC is to swap parts like test the processor on a different board or test the board with a different processor, also to test the PC with a different memory RAM and hard drive but when it comes to a notebooks is different since normally it is not recommended by the manufacturer to open it because most of the times that will avoid the warranty on it.
So, based on that at this point the best thing to do will be to get in contact with ASUS directly, since they are the manufacturer of it they might have different steps to try to fix this problem, maybe a BIOS update is needed, maybe they already have a work around to fix this problem.
So please do that, they should be able to provide further technical and warranty assistance in the case there is no option to fix it. If the notebook is under warranty they should be able to replace it for you based on their own warranty policy.
ASUS’s support site for Portugal: https://www.asus.com/pt/support
ASUS’s phone number: +351-211156011
Any questions, please let me know.
I'm not sure what's the problem, but after some tests, seems to be a problem with the Intel HD graphics driver ( Can be related to C-states? ) . I tried the latest driver version and old versions but without success. How can I workaround it? By pressing FN + F7, disabling and enabling the monitor, when the problem occurs, seems to fix temporarly. I can't deliver the notebook on Asus Support because I need it every day, I'm working with this workaround. Is something wrong with the production of this processor or something wrong with the Intel HD graphics driver?
The only thing I know is that in linux the baytrail processors have a problem related to the C-States and the problem is very similar, if I change to linux I even have to implement the workaround of this page https://bugzilla.kernel.org/show_bug.cgi?id=109051
Thank you very much for letting us know that information.
It is hard to tell for sure what might be the problem, could be the graphics could be the processor but also could be the board in the laptop.
Now, since you tried the Intel drivers and the problem remains at this point we recommend to try the drivers provided by the manufacturer since they were released to work with your system specifically so they might work better, try to install the chipset drivers as well:
Also another option will be to get in contact with Asus not to send the laptop to them but just to check if they have a work around or some information and a possible fix for this issue, maybe a BIOS update is needed or they might have different troubleshoot steps.
Any further questions about this matter, please let me know.