The only time I have seen pod style arrestors come apart is when the engine they are connected to is either out of tune, or has driveline vibration. I know the Prok's are notorious for it happening, but one of my mates and I fitted ProK's at the same time...I sold that ski with the same set, he had been through three sets at last count. Sometimes it's easy to blame the product. Yeah, they should be a bit more forgiving to real world conditions, but this is no perfect world!