It might be a timing issue with USB port. You can force the Edge straight in to mass storage mode if you hold the lap button down when you connect the USB cable to it.
same issue here it powers on when u connect it to a usb charger if you hold the lap button it doesnt however when u pull the power cord out it always turns back on! so annoying if you pull it out and throw it in ur bag the battery will be flat the next day! some times the auto power off will come up but only sometimes
This is beyond annoying, it wakes up my Varia tail light and drains the battery in my heart rate monitor, not to mention it will reduce the life of the screen, ect. for it to be on for hours and hours while charging. The only solution I can see is to check if its fully charged and if it is, unplug it. This is something I do not have to do with ANY OTHER DEVICE I OWN. I'm coming from a Wahoo, and they do not do this, and work flawlessly, regretting my switch.
Yes, it's the No 1 annoyance, closely followed by the touch of the power button bringing up the change back-light brightness option. Unhappy users are tending to move to Wahoo. I'm curious as to why you've moved from Wahoo.
This is just a usability fail of Garmin. It's the same with Garmin Edge 520, Garmin Edge 520 Plus and Garmin 530 (amongst others, but these are the ones I checked).
When the device is switched off, and you connect it to USB for charging the battery, the device will turn on and stay on.
But that's not all! The same will happen when you disconnect the power cable!
