I've had my 530 for a few weeks now and this morning I wasn't able to turn the unit on (from sleep mode). I didn't try holding the power button down - instead i plugged the unit into a computer which turned it on.
I now can't turn the unit off. Pressing the power button doesn't bring up the sleep/power off prompt that it used to do. Holding the power button for 10 seconds triggers a reset/restart so the power button must be physically working. I have tried factory resetting the device with no success. Has anyone else had this issue? I've tried searching the FAQ, these forums, and googling but couldn't find this issue reported by anyone else.
The unit otherwise seems to be working fine - I can start / stop activities, pair with my phone etc.
I might try updating the firmware to 5.24.