Weird behaviour?

While gaming (Witcher 3 to be exact), game suddenly freezes, and VRR gets turned on, and upper most refresh rate is 100hz, but my monitor supports 165. Then, sudden flashes of white streaks occur across the screen oftenly during gameplay. Restarted my pc, switched HDR off then on, and the streak is now gone. Any ideas why? Can i prevent this behaviour in the future?
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