Excal 1000, Excal II, Sovereign GT, CZ-20, Tiger Shark, Tejon, GTI 1500, Surfmaster Pulse, CZ6a, DFX, AT PRO, Fisher 1235, Surf PI Pro, 1280-X, many more because I enjoy learning them. New Garrett Ca
Both the comments above are correct....I wouldnt worry about it too much...i have had my ACE 250 go nuts everyonce in while....There are so many things that will do this...Powerlines..Underground Lines...hell..maybe bad batteries?