The Auto off setting should not reset every time the unit is powered off.
Obviously, if you forget to turn it off, you've probably forgotten to set the auto off!
This is a great battery saver feature. You hop out of the car, forget to turn it off because the radio is quiet. This way it would ALWAYS turn off. Have it beep for 5 seconds before auto off is activated with a simple touch of the screen to cancel it. My ham radios work this way and its great.
Most people set it up to turn on ad off with the key....better than using auto off, but I prefer a different connection that doesn't allow any surges at all during starting. I just saw one HP over the weekend that was damaged by this, but a few items added to the circuit takes care of any possible spikes. When the owner of the HP gets his uit back from repair I'll be making sure it oe't happen again....