I'm not a fling-wing pilot, however this report may give an insight into how a tail-boom issue occurred with at least one 22:
https://www.taic.org.nz/sites/defaul...03%20Final.pdf
Aside from that there does seem to be a Robby 'mast bumping' problem that's been around for some years and is presently under general investigation:
https://www.taic.org.nz/watchlist/ro...g-accidents-nz