The new Viper I saw a couple weeks ago came with the Ronstan Orbit mainsheet system with dyneema link. That would change the "shackle" story.
The dyneema link is basically a loop of dyneema or similar with a stopper ball and knot. We replaced all of the boat with brand new links or soft shackles. Several of these let go this week. It is the stopper ball that is failing. It will be changed. A little thing and simple. The other recurring issue was a spin halyard getting off the sheave. That happened several times and is a design change, most likely a different brand and/or size of block.
