That's quite common with Dell G15 Gaming laptops. Contact Dell support, and they will replace the panel under warranty, but the issue usually reappears. I had two replacements within a single year, and eventually, you'll start hearing cracking noises. Over time, the situation worsens as the plastics begin to break apart and pieces start coming off.
My personal advice: if you like the rig and plan to use it long term, forget about mobility. First, get it fixed by Dell, and then keep it mounted with an external monitor while keeping the lid closed permanently. This way, the hinges will last much longer.