Fortnite jerky when I change max fps?

I have a problem with Fortnite since today. I have always been able to play fluently with about 120 FPS Fortnite. I have always left the max frame rate unlimited. Since I turned on the PC today, the game is full. It follows so if you know what I mean. Incidentally, the FPS always remain at the top during storage. I have the max. Framerates made on 60 and it does not jerk anymore. Sometimes it may be that it jerks again at 60fps. I despair. Earlier, when I got into the game, it also crashed and there came this error message: "Application Hang Detected" and once came "Application Crash Detected". Then there was also a black screen 2 times.

Graphics Card: MSI Radeon RX Vega 56 Air Boost 8GB OC

CPU: AMD Ryzen 5 2600

16 GB of DDR4 RAM

Motherboard: MSI B450M Pro-VDH

Power supply: 500W Bequiet Pure Power 11

Weiniger searched and uninstalled Fortnite.

No, seriously, you just do not have to change that

Graphics card overclocked?

Nope

What should I not change

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