I'm not sure how B of A has their trading setup or their restrictions/rules. I would probably know whats going on if I saw it. You should be able to use margin at will, no matter how often you buy and sell. I use 2x and even 4x margin often and was able to buy and sell at will. Only time I can think of it being an issue is if you're buying and selling option contracts. Then it usually needs a bit for the funds to settle. Also, not sure how much money you trade with, but if you have 25K or less, I think there is a restriction on how many trades you can make in X amount of time. I believe its 5 trades over 5 days, and then you get flagged as a day trader. You will be required to bring your balance to 25K and then you can day trade all you want.
I'm just throwing out ideas. You're best bet is to contact BofA and ask them honestly.
FYI: Try not to listen to message boards. You will get probably the worst opinions there that can at times influence your own decisions. Stand strong, do your own research, form a strategy, buy the stock and always wear a condom for protection...err use option contracts I mean.
Honestly though, If you're newer to investing and don't have that much experience, you shouldn't use margin. Only use margin when you have proven over and over that you can successfuly make money trading stocks. Do this first before you start using other peoples money (margin). I can't imagine using margin either if you don't use option contracts to hedge your position. Because margin calls are brutal and nasty.
I know someone personally who shorted yahoo near its peak back in the 99-00 crash. He knew it was going to fall apart, he placed all his money on the line, used margin too. Stock went higher, and he got a margin call and couldn't supply additional capital to meet the margin call. So he was forced to liquidate. Then yahoo crashed from hundreds of dollars a share to teens.
Difference in his life? Lost his home and got a divorce vs. being a multi-millionare. But that example is extreme