I bought a new Aerobika on 3/6/24 and received it a couple days ago. It was fine yesterday and I cleaned per routine-hot (boiling) soapy water and rinsed in hot water. It didn’t work today and I could see the little green filter on posterior side was not closing completely, leaving a little open half moon for a second. I called Monaghan and when I gave her the lot number, she said, “ That's what I thought.” She said she had to alert team that this lot seemed to have issues. They are sending a replacement. If you’re having trouble, call them.