Enduro Bug - boot screen during activity when opening notification

Want to report a bug I encountered the other day. The conditions were a bit random but here's what happened for me:

- Tracking with Kayak activity (watch only, no external sensors)

- Text message notification appeared at top of screen

- Pressed down to open message

- Instead of opening message the screen switched to the boot screen

- Stayed on this screen for some time (thought it was rebooting so waited maybe 30-45s)

- Nothing happened to I pressed the back key

- Option menu came up for "reset to default settings?" or similar wording (not sure if this is a typical thing for the boot screen or not)

- I selected NO and the watch returned to the boot screen for a few seconds before returning to the activity screen

- Activity was left where it was, just paused and with no GPS connection

- Hit play, gps reconnected and continued as normal without any loss to the activity. 

Just wanted to report this as it was quite unusual :)