404 can’t be found in the bpost popup

Hi, recently we noticed that in some unknown circumstances the bpost popup is loaded, but the 3 shipping options aren’t shown. Instead we get to see our own 404 page inside the popup.

Very very weird, and it’s not happening always. It seems like the bpost curl services are sometimes down, which results in that 404 error.

A few days again already mailed bpost e-solutions, but no reply so far. Please, answer me. We are losing sales here.