Entune Plus head unit - NO HD radio after placing call!

So I have noticed something worrisome. If I am tuned to an HD radio station, with nice clear HD audio and the artist info on the screen and ORIGINATE a phone call, when I end the call, the head unit NEVER goes back into HD mode - dull, standard FM audio, NO artist info. I have to REBOOT the head unit to get it to tune HD radio again even though it is on the same HD channel I was listening to before I made the call! Even changing stations does not kick it int HD mode! This does NOT happen on INCOMING calls! Anyone else can confirm this bizarre behavior?
Thanx.

 

So, tested this weekend in Houston, so not weak signal. After the call, just this image - it SAYS HD but it is NOT HD audio:



So I waited, and in about 20 minutes, go this - DID download the album art but still no album details and STILL not HD audio. Never came back. Rebooted and all was well. Guess I'll bring this up when it's in for the 15k service.