It seems to be getting worse - today I stopped counting after twenty attempts to switch it on, and it took about the same number of press-and-holds to switch it off; I was about to remove the battery. The other buttons are fine and to turn the backlight on I zoom the map instead. But should it really be like this? I am finding it increasingly tedious. I have read lots of other grumbles about Garmins but haven't come across this, and wonder whether I need to send it back to Handtec.
On the plus side I finally managed to load OpenStreetMap,, create a track to follow on BikeHike, load it into the Etrex and follow it - yay!