I had a lot of luck last year. I took away the rig this year to replace it and found out that the superior connection from the stay to the mast had lost
the pin that prevented it to come lose.
I guess it has hold by luck and the use of backstay tension. Weird accident
since the rig was visually examinated at the beginning of the last season.
Not usual that to happen and nobody has an explanation for how that was possible.