It's not games played every day, but games played within a 24-hr period.
I'm Central time zone... the CDP clock resets at 7:00 PM . If I were to have played yesterday at 6PM, and then didn't play another game until 7:15 PM today, my CDP count would go to 0, even though I had played every single day. Mine has reset to 0 a couple of times for missing the clock, even though I've only missed 1 or 2 days of playing since I joined.
It's not a big thing... in 5 or 6 days, you're right back to the 880 xp points again. And there aren't any prizes for playing the most days in a row.