Past few days id plug my phone in at night to charge for the next morning... it would be at 40% or so when charging but 7 hours will past ill wake up and its only at around 88% charged when just a week ago it would charge to 100% with no problem. and also i would charge my phone during the day sometimes and it would go from say 50% to 60% in about 10 minutes but now struggles to charge fast at all. is it a update problem? i havn't got any new apps to make this change.