This past week something changed when reading my emails on my phone. If I read an email and go back to the inbox the screen dims. There are categories like ALL and Primary that segregate your inbox. If I leave it on PRIMARY the screen does not dim but I don't get all of my emails. If I use ALL, I get all of my emails but the screen goes dim after I read them, going back or deleting.I have tried everything I know to change back, even went to Verizon to see if they could help but no luck. If this is a glitch. please fix. If not, what can I do to fix this. Thank You