Have had my tab about 3 weeks, it's been charging ok. Last night i had a message come up telling me to plug in the charger which i did, after a few minutes it said it was fully charged, so i unplugged it and sure enough it very quickly went down to empty again. I then put it on charge for a couple of hours, once again it said fully charged, after about a minute it went down to 59%. Am i doing something wrong or has anybody else experienced a similar problem? Thanks in advance.