Got a snippet from a users log that show 11 incoming Action:com.google.android.c2dm.intent.REGISTRATION responses within 7 seconds. All reporting the same registration ID. Everything was handled correctly. This was a one time event. I have never seen it happen before or since. Anyone else notice anything like this.
Alas, that version was logging outging GCM registration requests, so I cannot prove conclusively that my app only issues one request. But I do not see any way that it could have sent that many. Unless the user press a register button that many times in rapid succession.