Hi, All. I have a 140 and while I was cutting grass, the blade just disengaged/quit (the mower was still moving, you could just hear that the blade was not working). My husband bought a new switch (the one that lowers and raises the blade) and it worked for all of about 30 feet. Then the blade cut off again. He's thinking there might be a short somewhere. Has anyone ever heard of this happening? Thanks for any help.