So I finally managed to fix the issue.
It was not a problem with any missing resistor at all. It turned out to be a bad solder connection on the Mainboard on any of the BGA chips. The troublemaker was most likely the CPU that had a cracked solder joint from the changing temperatures the device was used in by the previous owner, or just a manufacturing problem.
Anyways, reflowing the board in an oven at 200C or 369F for a couple of minutes seemed to have fixed the issue. No more freezing after a few minutes, and in fact the device was running for a couple of hours now without freezing.
So If anyone comes across a similar issue of where the device freezes after a while, try using popular DIY board reflowing methods using toaster ovens etc. found on the internet or consult a professional from a repair shop and let him reflow the CPU or DRAM for you. If best the whole board because I do not know for sure which chip actually had the issue, but again, it was most likely the CPU.
I will be closing this thread now. Thanks for any help!