- The bluetooth icon on the panel fades and it says bluetooth not available.
- And when this happens suspend will not work and when you close the lid, you can still hear the fan running noise intermittently.
Apple says to reset the SMC, see here.
But this may not work for most as this may be a hardware problem.
I faced the same problem and after heavy googling was all set to take apart my macbook to set right the problem.
But since i replaced the battery the problem rectified on its own.
Initially after the replacement the problem persisted. But gradually i started getting the bluetooth available intermittently and whenever bluetooth is available suspend worked fine.
Later i was getting the bluetooth not available problems intermittently.
After nearly two months of new battery it seems now that the problem has disappeared completely. Now bluetooth is always available and suspend works fine.
So the fix is : Replace your battery if nothing else works.