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I have exactly the same laptop and just recently I had the exact same problem. I thought it was my SSD just dying or corrupted in some way, and it turns out my little SSD is not the culprit. Yesterday I had done a bunch of reformatting my whole SSD because not only the problem didn't fix, but it felt worse than before reformat. So after a quick google search, I found this Reddit post and it suggested that the culprit is AMD's driver. So my solution is to install the iGPU driver from asus.com, not from AMD's website

My Asus Tuf FX505DT laptop has been working fine for half a year, but now it has started to randomly freeze, I cannot do anything, mouse does not work, nor keyboard nor screen.
All i can do is hard restart with the power button. I have been keeping my laptop up to date with all driver and windows updates, even reinstalled windows, the problem still persisted and now is even more often. I tried to check the ram if it was the fault but it ended up not being faulty so i am completely lost on what's wrong with it? PS i'm pretty sure what's happening is my laptop is being deadlocked.

Want a 7800x3d mobile [shown super power efficient, perfect mobile chip if under-clocked no?]
and a power efficient 7600 card [after that memory sharing]
96wh battery.
17 inch, decent cooling.
Pricing under 3k preferred.

Anker PowerCore 20000: 
20,000mAh 2x Usb ports Qualcomm Quick Charge 3.0 LED battery indicator *there is another version, Anker PowerCore Speed 20,000mAh where it includes Power IQ (some anker technology that claims to identify devices to give better charge)

Evga 2080 Ti Kingpin.
 
Also Gigabyte 2080 Ti Waterforce, Zotac 2080 Ti ArticStorm, Inno3D 2080 Ti iChill. They all have similar OC headroom though. 
 
 

Check out Sager, or Eluktronics