My computer doesn't seem to recognize a streak more than 3-4 days at most. I have gone on Duolingo almost every day since I started and the only lingots, other than the 1st time, are from my lessons and sometimes they are 8 parts long! Does anyone else have this problem?
Have you earned sufficient XPs when you come to the site? Your targer is shown on your home page. You must meet this target each day to maintain your streak. If the target it too high you can set it to a lower value in Profile/settings/coach.