Ozzy - It could be a number of things. The probes whether the old style or the newer style are sensitive to water. Cleaning the probe could have allowed water to enter. If that is the case, try drying it out with a hair dryer. It that does not work, you may need a new probe. Check the controller where the jack is. If loose, tighten it. If you take the controller off, to check for a loose wire, do so carefully. The controller (and probes) carry a 1 year warranty. Send Steve an email describing your problem.