Hey
Thanks for your response.
The dealer told me about the happening with IS250s and I couldn't find anything on this forum either. It's good to hear that no other people have reported it, maybe it's not as bad as the dealer suspects.
In response to your questions:
1. I have the same system as melodien. Sat Nav/Audio/Phone all together in the pop up screen. Like melodien, the fault is totally random (I realise this makes it MUCH harder to diagnose). It will do it once, then not for ages and then again a week later. (I feel like the typical blonde saying the car is doing this funny thing!!).
2. As mentioned above I can't pin it down to anything and its happened all over town. Yesterday it was raining and happened when I was braking.
As I said in the OP, Lexus Perth Service has been excellent. I can really only say good things, the manager spent time discussing the issue with me, has made follow up calls, offered to show me through the workshop etc. I can confidently say that Perth Lexus has lived up to expectations. I just hope they can find the issue.
I'll have a look at the Act you mention. I agree, too early to pull out something like that but I have to admit I feel like I should have walked up the road to Mercedes at this point.
Anyway, you live and learn.
Fingers *crossed* that they can fix it.