Screen randomly going black when in use

The last few weeks when using my iPhone and the angle of the phone movers slightly in my hand the screen goes black until the angle of the phone is moved again. Generally happens when the base of phone (where charging port and speakers are) are touching something and phone is tilted to the left or right slightly. The moment you tilt it back to the a specific spot/ angle the screen appears again as normal, still on snap app, site, video rtc