In reply to Babill's post of 1st Feb.
I have the same car,same year and same problem! At first Lexus were unhelpful but eventually offered to update to latest version, which as Babill has found, is not a fix. The next step I am told is to update the software version. For cameras the system is unreliable which makes it useless when used in unfamiliar areas. This thread has highlighted the failings of the system and the updating schedule, but are Toyota/Lexus taking notice?