Okay last night I put the phone on the charger at about midnight with around 23% charge. At 3:30 I wake up and check my phone and it's only at 95%. Normally it should have only taken a little over an hour to fully charge from that point. Now I will say that I did had the window open a bit and it did drop into the mid 20's (Fahrenheit) last night, my room was cold. Not sure if that could have effected the charging. I rebooted the phone and it was fully charged at 6:30 when i woke up. Should I be concerned? Anybody else have the same issue?