CNBC Daily Open: Tech sell-off? Investors could just be taking profit and enjoying the summer

If you have any U.S. technology stocks in your portfolio (and let's face it, who doesn't?), you might want to look away. For the second day in a row, tech stocks dragged markets lower, with the Nasdaq Composite slipping 0.67%. Juggernauts such as Apple, Amazon and Alphabet were more meh-nificent…