Hi Everyone,
Thought I would update everyone on my XM issue in case anyone else is having it. After 6 trips to the dealer and a complaint to Lexus and consulting a lemon law attorney (a friend), I think they fixed it.
The dealer insisted that there is no known issue regarding the sound going out with the reception still on. I finally got it to do it in front of them and they acknowledged the issue. The replaced my radio and not the XM transmitter. Two weeks later...same problem. They just replaced the XM transmitter and informed me that there is a known issue (Technical Bulletin) on the XM transmitter but that they never knew because they only found out when they called Lexus (after 5 visits?). So if you are having this issue, you have to fight and threaten until they respond. I also video taped the issue with my phone for proof as my next step was going to be to threaten to use the lemon law for action (I told this to the service writer). Keep in mind, I was taking this extreme measure since they refused to fix the issue as they claimed since they couldn't see it, it wasn't an issue.