IOS 11.4 Big bug. Anyone knows how to solve this?

After updating my Iphone 7 to ios 11.4(15F79) the sensor that regulates autobrightnes is doing something wrong. Any time i put my finger on the black dot (autobrightnes sensor) my screen goes black and when i move finger from that dot the screen is back to normal. It doesnt matter if i am in youtube or Facebook or doing something else. Anyone has this problem and is it way to solve this?

Thanks in advance!