just downloaded to 3.48 two days ago and i cant make it through the day without having to charge it. pulse ox is not on. i havent even listened to music since the update. the only thing i did today on it was timed a 40 minute yoga. had to charge before bed since it was at 30%. it was at 100% this morning at 530am. is the update draining? only had device for 3 weeks.