Do you have an e-Rewards account with AA? I had it through a couple of airlines and the surveys just stopped coming in months ago, probably because of the speed with which I completed them. I noticed a couple of weeks ago that you can sign up for e-Rewards without an invitation through the AA site. It's a public offer there. You get 250 AA miles just for signing up, and after I did I've been getting 2-3 surveys per day.
Thanks. Indeed I did have an account with AA. I will try signing up yet again.