lately whenever I use my navigation screen it reverts back to a previous screen after about 10 seconds. for instance I used to be able to leave it on the radio screen indefinitely. now it reverts back to a screen that I had been looking at, for instance the map, after about 10 seconds being idle. It's annoying. I would prefer that it stays on the screen I set it to until I decide to change it. Any suggestions? 2010 RX 350.