On my prior Edge 520 if you plugged in the turned off device to charge it, it automatically turned on while charging, but once you removed it from the charging cable it automatically turned off.
With the Edge 540 after charging when I remove the charging cable, the power remains on and doesn't automatically power off. I have to push the power button multiple times to power it off (hold down power button, then select power off, then press button). So three steps to turn off the device when it was done automatically before.
I assume its been removed from (or was never included) in the 540 firmware compared to the 520. If so, this is SUPER ANNOYING. Please bring this feature to the 540.