Beginner's luck gone bad

[JimGil]

I've been reading 2+2 for a few months now and have rarely posted, but I have a question.

I've been playing online for 6 months in Pokerroom and Party. When I first started - I couldn't lose - I was playing the micro limits and racked up about $300 pretty quickly. I moved up to 1-2 6 max and won about $500 shortly after. I felt I had a good understaning of the game, I hadn't read any books yet and I felt pretty confident.

Then, I read Lee Jones' WLLHE and Sklansky's HP and thought I'd be unstoppable. Well, I lost my stack plus about $400 over the last few months.

Is this typical for a begginer? I'm very patient and am only playing premium hands - and playing them aggresively.

My question is - is this a normal cycle for a poker player - to win early, give it back plus some more, and slowly build back a bankroll? Or am I just fish who got lucky early on?