OK, try lubricating everything, this means clutch actuating arm, external gear change mechanism, etc. This is located on top of the gearbox and the battery and/or airbox need removing to access this.
Is it the same in all gears or is it more pronounced in 1/3 or 2/4.
You need to check the hydraulic clutch mechanism to make sure that clutch is not dragging and that the clutch isn't on the limits of wear.
Last, check the gear change cables and make sure they aren't compromised.
Also, some folk have had success in changing the gearbox oil, X reg is probably well overdue.