I've got a 10 year old RX400hSE. I upgraded the sat nav a few years back but recently it has started producing very strange routes which take me significantly out of my way. I've gone into the settings and checked them (one reason may be that it appears to have defaulted to no toll roads, which may have meant it was avoiding the Dartford Crossing). However, it is still doing very strange things eg 2 miles from my home it directs me on a route which is 6 miles long to get there. Anyone experiencing anything similar or has any suggestions to resolve? I'm not minded to spend another £150 on an upgrade.