My first m8 didn't.. Solid buttons but my second one ( returned due to loud static from earpiece) did..but I just ignore it..all phones will have some sort of defect due to mass production.. Ur replacement may or may not have the problem.
Mine has a little give on the sides, but I don't consider it a problem, especially with a case on. I have been hearing some slight static from the speakers though, mentioned by someone above. I can only hear it if I press it against my hear during calls though so I'm not worried
Mine does but when it's in a case (Diztronic TPU) no rattle!
My S5's camera lens rattles worse!
No worries, I don't think the buttons are going to fall out!
I'd rather they be a little loose than so tight they stick! Imagine that!
My first M8's volume was horribly loose, so I exchanged it and my second one's is better but now the power button is horribly loose and the sd card slot sticks out.... hard to get a perfect one