several surveys I qualify for end up with SERVER 404 errors - bad links I assume. please test these and remove them from the rotation. I addition, once I get more than 5 questions into a survey ,I should not be able to be able to be disqualified.
I have recently been 30-40 questions into a survey and been disqualified ... if I spend 15-20 minutes answering questions I should be rewarded with the full survey credit amount.
you should disqualify any survey that can ump a respondent out after 4-5 questions for qualification.