My Cardinal did the same thing. If you have the Lippert hydraulic slide system, the problem is most likely a bad cylinder. The cylinder needs to hold pressure when the pump is not running. When one of them has a internal leak, it allows the pressure to leak off of the whole system. There will be no loss of fluid. You can find a troubleshooting guide on the net. I replaced the cylinder that was bypassing, and the slides all stay in now. I did replace the whole pump system first and it did not help. The cost of the cylinder was around $100.