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I have a digital timer control box. When I turn the dial to set the time for each irrigation area, the digital read-out flickers between 10 minutes and the time that I set. I can get it to appear to be set for the time that I want, but when I flip the dial back, it has reset itself to 10 minutes. If I jiggle the dial, it flips back and forth between 10 minutes and the time that I set. Many times it won't hold the time that I set. It even set one to 5.9 hours that I had set to OFF originally. Is there anything I can do with this unit besides replace it?