Lenovo Ideapad 320s Brightness changes in Netflix

I just got a new Ideapad 320s a few days ago and I'm now noticing that when I play a video in Netflix, the brightness of the screen tus darker and brighter everytime a scene changes or when a subtitle line changes.
How can I change my settings to stop this? It's only happening in Netflix from what I've seen so far. 
Thank you!