Do anyone know what this means, my navigation screen keeps rebooting to this screen please help.

 

Was not aware that the 2009 IS 250 was offered in a Hybrid model. Is the vehicle a Hybrid (Battery & Fuel), where you would select MENU, then click Info Phone on the Multi-Information display screen, then select Fuel Consumption to view the screen you've posted above?

Unsure if this may apply to your model however, here's addition discussion about the similar issue;
Radio/NAV Screen Keeps Resetting (RC F 2015-present)
https://www.clublexus.com/forums/rc-...resetting.html