Hit the starter and get a click, the speedo arm sweeps and your trip counters and MPG reset?
Bad earth, had mine into the dealer 3 times, been clear of the issue for 900 miles now (trip 2 not reset yet so i know it's ok.....) they fixed it on the 3rd visit acting on 'advice from Triumph on the issue' - no more detail than that i'm afraid.
0-60 in .......oh! wait.... I really don't care anymore (but it's still 1200cc of raw throbbing Trumpet so bugger off Mr.Scooter!)