My Ryzen 7 1800x has been running perfectly for about 2 years and just recently has started getting stuck at 0.54 GHz and randomly jumping up then back down to that speed. I was playing No Man's Sky when suddenly my computer started acting up so I closed the game and noticed my CPU speed. My computer specs are ASUS ROG B350-F Gaming, 2 8GB TRIDENT Z RAM DDR4, a Gigabyte 1080 8GB GPU, and my CPU is water cooled so heat is not a problem. My power supply is a Corsair RM750x. Any help is appreciated.