Has anyone else been experiencing any issues when charging your the a100? I have noted that everytime I plug it in to charge while I am still using it, I have to hold it very still or it will go from charging to not charging to charging, etc.--like the connection is not tight. I haven't dropped it or anything, so the power jack shouldn't be loose. I just bought it back in December so perhaps I should send it in to be repaired??? Thanks!