This problem started today. I have looked at similar problem reports but none of the workarounds are applicable. Everything else is working fine and I have no network or bluetooth problems. When selecting an activity from the Daily Details page the Network Connection Error is not displayed on the red banner at the top of the screen as per usual but is a white box in the centre of a blank black screen with OK in blue under the message. Selection OK clears the message box leaving a black blank screen with only the blue back arrow available. Selecting this takes me back to the Daily Details page. Anyone experienced similar and found a way around it? I have updated both sets of software (watch and phone) to the current supported levels but the problem persists.