After more feedback from other owners with the same issue, I purchased a ScanGuage2 ($170 del) and fitted it in May this year, and the lights have never flashed since, and if they ever do the ScanGuage2 can easily clear the codes and stop the flashing I am told. This was a great relief especially when mine were coming on about weekly with one time I was stuck in low range and couldn't go up the Highway, i'd have to keep starting up, stopping and waiting and after 6 or 7 restarts they would go off.Its the best add on I've ever purchased, it has many other features as well. But the real shame is Toyota say it doesn't happen.