I've had a search around and can't find the answer to these problems, but apologies if they've been covered before.
I've had my IS250 for 6 months now and on the whole it's been great. Recently though whilst messing around in the options menu, I ended up restoring one of the old user settings in the memory. This obviously changed lot of the options, so I had to go back and change everything again. Since that day though, I've had two niggles that just haven't gone away.
Firstly, the screen will now not reliably dim when driving with the lights on/at night. If I'm driving during the day and it gets dark it will dim, but if I set off when it's already dark it won't go dim straight away. The only way to force it is to switch the dimmer knob all the way to the right and back again. The strange thing is this will dim the screen and invert the colours, but only until I go below about 5mph. It will then go bright again, and stay that way until I toggle the switch again. I'm not sure if this is an intended feature, but I certainly can't find an obvious way of turning it off.
Second issue, is that the navigation will now not automatically reroute when I go off the original planned route. It will now just stay on the original route, and I'll get no voice guidance until I return to the original route. Again, I've played with all the settings and can't seem to change this.
Thanks in advance for any helpful tips.