I can get roughly 2 hours and 30 min of usage in 100% charge. if i am on phone for 30 min..it goes down roughly 20-25% internet it goes down 1% about every minute and getting worse. Also the back of the phone now gets burning hot when i play a game or go online. Should i bring it to an apple store? I mean i use it for 1 hour at a time now and i have 30% left and can't really use it unless it's on a charger...