[whywhywhywhy]

Nope it's completely silent failure, only thing noticeable is I think if I toggle it on and off in the menu a few times it will freeze coming back on. But rebooting fixes it.

But yeah AirDrop wont work in the state so it's likely the same issue because on a long enough uptime the chip crashes without fail.

[ilikejam]

Don't know if you're aware, but if you click the bluetooth icon in the menu bar with Shift and Option held down, you get a debug menu that lets you reset the bluetooth module - might save you rebooting.