Glenn in Texas

I bought my '08 GX470 with 23,000 miles on it and a full warranty. I have the flickering issue as well. After many trips to the dealer, calls to Lexus, and a factory rep looking into it, the official response was that there is a known defect in the Denso Nav units. Lexus is looking into a fix, but most likely will not be able to address this. Since it is not a safety issue, there is nothing else Lexus will do for this problem. This was my 5th (and most expensive) Lexus. Very disappointed that this "upgrade" was so badly engineered. I agree with others on this board that the functionality of this unit is lacking in basic common sense.