The strangest thing happened today, I was mowing along, not really doing anything fancy or stupid, didn't hit anything and no real roughness, wasn't going but maybe 1/4 stick, grass wasn't thick or tall or anything at all... Suddenly the blades stopped running, I tried pushing the PTO and it would engage for a split and then stop again, so I stopped the machine, got off and looked... The main engine-to-deck belt had come off, the one that's secured via the spring-loaded lever, which I released... I checked everything, the belt is almost brand new, no cracks or tears, no other apparent defects. I got it back on, checked everything again, saw nothing out of whack and the belt had plenty of tension so I started back up, was fine the rest of the day. Has this ever happened to anyone? It was a first for me, I suppose maybe a stick got up in there between pulley and belt?