I recently bought a wrist strap for the OM-D and started using it to carry the camera on the streets. After I changed the way I carry it (from neck strap to wrist strap), I noticed the camera doesn't go into sleep mode as before. I did some tests and realized that if I keep moving the camera (which happens when I am carrying it with a wrist strap), it simply won't go into sleep mode. On the other hand, if the camera is not shaking too much (which happens when I use a neck strap), it will go into sleep mode after 1 minute as usual. Is this normal?