I'm pretty sure the Sprint does not have a floating setup... from their site:
- Aluminum hats on Endurance discs are floating, while hats on Sprint discs are bolted
If yours is floating, perhaps it needs to be tightened up?
That said, no noises from mine, but I probably abuse them far less. If it's a new noise, I'd suspect wear related or heat-cycle related. Inspect all fittings and fasteners.