Welcome to the forum..a cautionary tail indeed..Pleased you both survived.

Young/old we all sometimes press the 'go' button and tbh I do till about 80mph then find myself thinking..why?..slow down and 'enjoy the ride old man' runs through my head. So I do.

56 soon and I'd like a few more years riding!

Dont know why yours became unstable though. Mine feels like its on rails. I am obsessive about tyre pressures though..AND new/decent tyres help.

Enjoy the forum and ride safe.