Watchface temporarily reverts to garmin default watchfaces

Anyone ever heard something like this? A user owning a Decent MK1 tells me following observations:

  • my watchface is installed and selected
  • in the afternoon he often sees the default watchface
  • pressing the widget button and going back to the watchface brings back my watchface

I assume in this case my watchface did not crash - or did it? As far as I know my watchface would not come back after a crash without reselecting it manually