I got the sony xperia z2 phone three days ago. I have realized that when I try to charge it, it takes the whole day and night. For the first charge I took it off minutes to 3 in the morning after being pulled in from around 10 am the day before. That's the only time it went to a 100%. When I plug it in to charge it, it continously increase to 66% where it stops for hours. Is this unsual?