Hi I have recently bought a new garmin 935 and noticed when I have it on my wrist the backlight is always on. It gets brighter when I press the light button but never full switches off unless I take the watch off. I have tried adjusting all the backlight settings but no luck. Does anyone know how to fix? It is quite annoying as it means my wrist is always lit up. I owned a 935 that broke and had to be replaced and never had this issue. Is the watch defective?