Shortly after getting my 05 last year, mine went from 5th to 1st or 2nd in one downshift. Massive sudden rpm boost as I released the clutch. Scared the piss right outta me when it happened, and I'm not even sure it's supposed to be possible. It is... Apparently... Single instance issue... So far...
Well, they could not find the cause yesterday and I had to leave it so they could talk to Triumph Monday. It was falling to a false neutral from 3rd pretty consistently on deceleration. I wish they would offer me a deal on a new one and I would just trade so they could study this one. I am not sure I will be able to trust it after this episode.
Just caught your post on jumping out of gear. It happened to me and they found a small spring broke in the transmission area. Quickfix by dealer at a low cost.