I've raised this up with Product Support....
Has anyone seen this sort of screen tearing before? It is intermittent and started happening a few days ago. Soft and hard resets have not changed the situation.
It really does come and go. It can go hours without issue, then tear for 30 minutes or so, then go back to normal. Whether it is on Bluetooth, on/off my wrist or in or outside seems to make no difference.
There is no physical damage to the screen or device (that I can see!)
