Our Frigidaire dishwasher will start to flash the digital numbers when it is down to about 43 min left on the normal cycle. The unit will start to make a noise like a relay is engaging and disengaing rapidly. Sometimes it will shut down and display CL. I know CL means the door is open but I can open and close the door with no results. If I open the door and leave it open for 20 mins then most often it will continue with the cycle sometimes without any further issues and sometimes it will flash again and shut down. I took the whole circuit board out and checked all connections to the door latch. After cleaning everything it did a complete normal wash cycle 1 time. Any ideas??

David