We had a basement bathroom put in about a year ago. The bathroom is used very little. We put a Ridgid pump in. 1st month it seemed to run ok but after that it would continue to run and not shut off. I would unplug it and wait 15 minutes, plug it back in when I wanted to use it and unplug it if it continued to run. I called someone to look at it in December 2010. They said it had some dirt on the sensor. For about 2 months it worked fine and now its back to the same thing. It will continue to run until I unplug it. If I wait for 15 minutes, plug it in again it will be ok until the next time its used. This is getting tiring. Is there something wrong with this pump? We bought it from Home Depot and I'm frustrated. Please help.