a while back. Had put it up because it had developed a leak. Attached a freshly charged hangy tank and ran several quick 'dry fire' shots through it and the leak was fixed! Was glad to get to shoot it again after so long. Quiet power is welcome around the yard even though the nearest house is 1/4 mile away with a few more scattered over the next couple miles of radius. A week later and it is still holding.
....probably just a small piece of debris that got blown out of the way. Whole lot easier than tearing it down!