so I have a black and grey sleeve tattoo, not solid lots of small details. I've tried the watch in both wrists and the heart rate sensor is pretty much identical on each wrist, the tattooed and the not tattooed. However, on the tattooed wrist it locks every time the screen goes off. On my untattooed arm, it doesn't lock unless I take it off. It seems odd since the heart rate is the same on each wrist but wrist detection trips?