A strange issue just materialized. For the past week or so, I am only able to make one mobile call. After disconnecting, if I try another call, I get no audio. If I try again, I am told on the Lexus display panel to chech my phone connection. The call DOES go through. If I switch the phone to spakerphone, I hear the call going through. But when I switch back to heads free, no audio! Rebooting the phone does not resolve the problem. Restarting the car lets me make the initial call again , but I encounter the same issue on the next call. I tried connecting another phone to my Bluetooth and encountered the same issue. So it's the car, not the phone. I have a 2006 GS300. I use an iPhone5 with the most recent OS. Any ideas?