It gets stuck on all the time for me, I didn't think it was linked to what button you have it bound to, I thought it was just how the key action was designed -> which was to toggle the player's movement to the 'Turbo' state.
The only thing is when a player stops moving or runs out of stamina, the 'Turbo' state is not switched off automatically.
As a result I have to manually press it again whenever I stop moving or am fatigued, just to tell the game to switch off 'Turbo' mode. An unnecessary extra keypress in my opinion, seeing as pressing it doesn't provide any visual feedback. (I use Turbo (toggle))