Both my wife and I have this problem, so I guess that this could be a possible reason, but we had had no problems until early April. Besides, I was invited to join by Iberia.

I sent an e-mail to Customer Service a few days ago, and got this reply:

"Thank you for contacting e-Rewards. We apologize for the difficulty you have experienced with the recent surveys. I have submitted a request to technology so they can look into the expired survey issue. We hope to have this resolved for you very soon."

Not holding my breath for a quick solution...