Hello, when they get stuck in the pipes they are getting stuck on a clog that was forming prior. The goal in getting them stuck is to help the air pressure build up behind it to push the entire clog through. You have less suction now, right? If so you want to hold your hand over the hose and let the suction build up and then release. Do this for 5 minutes, some times rapidly. If that doesn't clear it then call us.