Originally Posted by Yamae
Did you check the ACC voltage at the radio/nav unit?
Is it keeping higher than 11.5V while the engine is on?
When the ACC voltage is dropped and then going up, the radio/ nav unit is reset automatically. We call it a power-on-reset. When the supplied voltage is too low and then going up higher than the limit, the reset circuit works and generates the reset pulse.
I suggest you to check the voltage while driving setting up a voltage meter and see the voltage. If it's going down and up, check connections.
If the voltage is good, then you need to check the reset circuit, but this needs some technical skills.
Yeah, I was thinking there was a voltage drop going on. Prior to the reboot problem, the display would sometimes suddenly dim, then get brighter.