On occasion when I'm riding where I don't really need the Dinotte 300R for safety purposes right awau, I'll ride with it mounted, but turned off. On a long ride, such as a century ride where battery life is a concern, I'll leave it off until I either hit traffic or it starts to get dark. Sometime later in the ride, several hours after starting, I try to turn it on and the white button does not spring out to allow the double-press to turn on. I push the button, and it says in, or lazily comes slowly back out. Is my unit defective, or is this an 'undocumented feature'?