Audya 4, Audya 5 and Audya 76 are all identical except for the multitabs on the 4 & 5 and slight changes in the OS to allow for different panel and MIDI layout. They use exactly the same internal parts and hard drive data. No one model is any more prone to problems than another. I was suprised to hear of Rusty's problem as so far we have not had a single faulty Audya 4 or 5 in the United Kingdom.