Tampa,
Personally, I would be surprised if this is a bug.
Some diagnostic thoughts:
Are most of the "drops" scheduled by the same staffer? If so, watch them schedule some "dummy" patients repeatedly and see if you notice an error.
When you use the binoculars under the patient list to see the patient's appointments, do the missing ones show, perhaps as a "DNKA".
Consider going to the audit log (View...admin options...File...Audit log) and filter to view the patient and see if you see them being scheduled, and any other helpful activity.
I don't know how many patients are on your schedule each day, but if 5 appointments in one day are missing, this shouldn't be too difficult to replicate and track down. Consider getting online with AC support and have them watch your staff schedule several appointments, and see if they can pick up a problem which prevents the appointment from actually being scheduled.
