I am not sure if that will help, because I don't think it's a motion problem.
It sends 2 pictures every 5 seconds, even it there is no motion detected. But when it detects motion, it sends 2 pictures and a small log telling me "Motion detected" in adition of the 5-seconds-pictures.
If it was a motion problem, it would make a video recording too. And that is something the camera doesn't do. It records only on motion. In my case it recorded 394 events in a period of time, but it sended me 2364 pictures.
I think there must be a setting somewhere that tells the camera to send 2 pictures every 5 seconds no matter what.
Problem is: I can't find that setting.