Did that happened immediately after refuelling, if so the tank was overfilled just fill the fuel tank until the pump stops but then do not top off. Most of us have had that happen.
Actually, yes it did. I wrote off the initial bogging as too much overflow fuel in the canister. Had the same problem with my MotoGuzzi V7 before their check valve recall. But when the symptom persisted intermittently for, say, 60 miles, I assumed that something more sinister was afoot. I confess, topping off has been my compulsive habit for 55 yrs. Thanks, Rog G.