About 2 out of 3 times when I discard the data from recording controls (Menu > Recording Controls > Discard > Enter > Clear > Yes) my 66i is going into disco mode. See video here:
The "LiveTrack" and "Recording Controls" icons start flashing and the device is not responsive anymore at all. It would take 3-5 seconds for it to recognize any button being pressed. I can hardly do anything with it anymore other than rebooting it (press the power button for about 10-15 seconds, then the display fades away).
It is on the latest software: 5.5 (377262)
It would be great if Garmin could fix that in a firmware update.... unless I am doing something wrong of course, in which case I'd be happy for someone to tell me.