So I was watching a video by MKBHD, a good youtuber check him out for tech news, and he made a comment about a phone and people complaining about screen yellowing. I didn't know this was an actual thing. I started to notice it on my nexus 10 tablet. Ive had it almost two years now, is that a common occurrence due to wear and tear? Is it a manufacturing problem?? Thanks for the help!