Hi , yiğitbirinci.
I am Ivan, I will help you with this.
It's ok, that's normal, you don't need to lower the monitor's hertz, that's because the GPU usage base, it can go up in a peak and come back depending on the use like watching the video.
You can rest assured that your gpuu is ok if you want to know what is being used by the GPU you can monitor it through Task manager or Nvidia Panel desktop tab select show GPU activity icons.
Disclaimer: This is a public user-to-user community forum. None of us here work for Microsoft and it is beyond our capability to assist directly with the account or login-related issues.
Hope this helps.
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Independent Advisor - Community
Thanks