We would always recommend that you update your Tom Tom GPS Sat Nav with official map downloads because this will lead to peace of mind. You can drive to your new destination, country, region, or destination safe in the knowledge that your map and route directions are completely up to date.My 920 (NC 9.702) has only the option "power off" by disconnecting power supply. It occurs mostly when unit is connected to power sorce and is turned off, but actually sleeps, then is disconnected properly and it powers back on and needs powering off properly. Can be annoying too as sometimes if not fully off, drains the battery. My not help, but I found out that the power socket stays on in my car 30 mins after the ignition is off and key removed, or as soon after the vehicle car door is opened and then locked. Without doing anything (No anew connecting to power supply, no touching the device, nothing). These "auto switch on"-functionality i know only from a modified NC 9.510 from @downunder (based on an older NC9.xxx).By signing-up you can access four new map downloads every year to make sure you always drive with the latest routes and directions, or you can simply purchase a one-off map refresh.These are the Tom Tom map download options available to customers.
It has to go into the sleep position otherwise it isn't possbile to detect if power is back and realy strange it take exactly 45 seconds with mine GO910 It's rather difficult to ask him what he is doing during these 45 seconds Ok, then these "automatic off" option is a senseless thing in all of these cases, where the device (my 920 sometimes or your 910 every time after 45s) makes a restart without any doing by user or power plug.However, these are not official updates and cannot be guaranteed to be completely accurate as you are relying on another Tom Tom user to have updated your GPS.We would recommend that you go download official Tom Tom GPS Map Updates, and here is how: The official Tom Tom Map Update Service is the only official way you can guarantee the latest maps on your GPS Sat Nav.However, it will make more financial sense for you to sign-up to their Map Update Service which is described below.Strangely this works out cheaper than a single map update purchase.