Last Saturday I experimented an issue that happened to me a long time ago: switching between views (button # 3) took up to 15 minutes between the push and the action.
I turned several times the device off/on but the issue still occured.
I went back home after the two hikes of the day, sync the device, turned it off and charged it.
The morning after I turned it on and everything was back to normal.
It already happend to me once a long time ago and the issue was solved the same way --> it could not be done on the go, when training, wich could be an issue.
It was, also the same button (#3, teh one to switch between screen views).
Did somebody experiments the same issue?