This has happened to me twice now with 2 different pods and it is really frustrating. I just purchased 2 new AIO pods because there was no suction with the pod I was using. I had tried everything with that pod (emptying, cleaning, new coil) and it was as if the airflow was completely blocked. So, I purchased 2 new pods. I used the first one fine for a few days, but as soon as I changed the coil and refilled it, I encountered the same problem. No suction - completely blocked. I am now on Pod #3 and it is the only one I have left. I really do like this little Nautilus AIO, but I just can't keep buying pods only to have them fail! Does anyone know why this happens and how I can fix it? Thanks