If you search the web for "brake pad separation failure," you'll find others have experienced the same failure.
I'd have to guess adhesive failure. Either the glue itself or method of application. Raybestos is a name brand and I can't image your problem being more widespread than a small batch.
I certainly can't image your street driving being the cause. If your driving hard enough to cause pad/baking plate failure and the adhesive and workmanship are 100%, you would have trashed the rest of your braking system months ago.
If this happened to me, I'd call Bear, Willwood and Stoptech to get professional opinions. I doubt Raybestos would admit to anything for legal reasons.