Hi , I bought a 5s the first day they were released and the battery life seemed terrible compared to my friends with an iphone 5. It seems to have improved a little but I'm not sure it's performing like it should. I took it to the apple store the first week and they reset it saying that some apps were constantly crashing and causing the battery to drain. Do you think I should replace the phone ? This picture is the best use I've had and was right before it died. Thanks for any advice!