My system has always been stable until C7.0, then I started to experience CPU overload and “crackling” audio noise a couple of times in every song.
The problem eventually went away with C7.05, but was reintroduced again with C7.06. Then I updated to C7.5, the problem remained. Then I updated with the new MR816 software which was released a couple of days ago. Still the same problem. Finally I updated the OS to Mavericks and now it works again!