Occasionally (20-30%) of the time when my riocar boots up in the car the button illumination level gets "forgotten" and the buttons don't light up. I then go into the hijack menu (v253) and the illumination level is still set correctly but no lights until I change the setting and they come back on. Then when I shut my car off and the player goes into standby mode the buttons stay lit up. I have to turn it back on and turn off the button illumation. This seems to be an issue with hijack, but are there any other possibilities? Power supply, etc.??