Sony Ericsson P900

I got my P900 almost a week ago. I charged it 3 times. The first time I charged it about 12 hours. This charge last me about 1 days or so because I played with it a lot. Then the second charge was done on the stand with the USB plugged in. It was kinda wired but overall, ok. It was fully charged. Then last night, I charged it again on the stand, it just didnt charge up full and stopped at 2/3. Reconnected twice and still doing the same thing. I took it off of the stand and connect directly to the charger. It was fine then. Has any of you experienced this?

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