This is also happening to my phone on the same side. Going to take it to my wireless provider and see if they can do anything. I had the same issue with my galaxy s6 and had to go through my wireless insurance to replace it. They didn't have any galaxy s6 so they sent me a galaxy s7 but it has been less than a year since I got it and now the back of this phone is coming off of this phone too. Looks like samsung is having issues with how the back glass is held in place.
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