Hello. I've had my nexus 7 for less than a year now. I have been recently having some problems with extremely bad lagging and freezing. Nothing runs smooth anymore and animations are choppy (for example, opening Google chrome). Another thing is battery life. It charges super super slowly with the standard ASUS charger and with another charger of the same rating. It also sucks battery incredibly fast (about 5% every 2-3 minutes). What do?