lipo wont stay in balance?

[stampy]

ever since the first day i got my pack (hyperion 3700 3s) it wont seem to stay in balance. after every run it is in stages from a min imbalance to a big imbalance, i can charge it at any thing over .5 amps or it will charge imbalanced, no matter if im charging through the balancer or not. i love the power and the lightness but this is a pain:mad:1 . what could be going on.:019: