BASIC STRATEGY ONLY

I am a new player and things are going very well - playing perfect basic strategy ONLY (Vegas Strip 6-deck). Maybe one of you pro players can tell me if my winning bubble is about to burst.

Here's what I do: I play about $50/hand, play basic strategy without ever counting, go up and down, and - when I am up $300-400, I quit immediately, and then put the winnings in the bank. With a large bankroll, I can stand the valleys as I wait for the upswing.

So far so good........after about 50 sessions. Is my luck about to run out?