Your probally right about the suction being too much. If you have a main drain and it get's stuck there you need to shut the drain off as the two suctions will stick to each other. If it get's stuck in random places then you just have to much suction to the unit. You can test by slowley pulling two of the hoses apart to let some of the suction escape. If this fixes it you can purchase a dirveter to mount where you mount the cleaner. Their may be one in the box your cleaner came in, so be sure to look there first before spending on a new one.Good luck.