Blackjack streaks are as bad as poker streaks. I've had days where I couldn't make a 20 win at all on the table, and days when it didn't matter what I get, 9 out of 10 hands were going my way. Like anything else, it's just being able to ride out the bad days and make the good ones work for you.
Just as an aside, I had a $500 scratch-off ticket today... the fourth one in the last three months. Folks hate me at work now.