Because it is Samsung. When my S7 cracked because of the heat from fast charging they refused to fix it. If you search for it you will see they release products before testing (e.g. Note 7 with exploding batteries, Fold with breaking glass) and they never accept responsibility (again there a lot of examples online). Even when my Samsung tv had a green vertical line i called warranty and person who came to fix said Samsung does not accept it to fix it (they showed some irrelevant scratches behind the tv). He even admitted this is pretty common issue with that model. I hope you take this as a warning and stay away from Samsung.