As mentioned previously I built my own custom ti belt drive bike with an alfine8. Only recently did my gates 24t alfine pulley start to die. It was made up of the pulley, snap ring and the 3 lug internal. The internal 3 lug is what gave way, started with a little movement then gradually got worse to around 4mm of radial movement. No sheering or violent breakage. Probably only had about 4000km on it, however it was replaced without question by gates Europe (they've always been super helpful). The replacement is a newly designed one piece unit, but can't comment on it as i went back to a ss belt setup.

If anyone is suffering from creaking, try dropping your crankset bolts in some engine oil.