You say you've been playing a year, but how long have you been playing 100? A 400 dollar downswing at 100 is not that much. It sux, but if you stay at this for a year or more you will see lots of those. I think that since you are making money, you are probably a decent player, and you probably know what your doing wrong. Most half decent players do. Your probably doing the opposite of what you should be, calling down w/ moderately good hands and slowing up killer hands. Stay at this and DONT LOSE CONFIDENCE.