I have not been able to take a GF DS since 3/28 but today I got this page after submitting the qualifying questions:

Oops
It appears that you have already taken a survey today. Not to worry. There are plenty of other opportunities for you. Please try again tomorrow for your next chance to participate in our Opinion Surveys.

I have not taken a survey today or any since last week, so I'm not sure why I am getting this page.