Just had that happen with my system, i found out windows update was the culprit.
It constantly tryed to update windows, but it was corrupted some way. so it just totally went banana and acted like me pressing F5 on a homepage.
i had to instal a new OS to fix it.
my thought also, i wish i knew what karat they use.
i have acces to a lot of used equipment, and im intrigued by the possibility of it to be extracted.
https://www.wired.co.uk/article/extract-gold-from-electronics
few grams you say, at the current price of gold a few grams is more expensive then the motherboard. i do not know the purity they use so it is a statement with some salt.