Pioneer Z1 - Software Bug????

[f5fstop]

If the radio is set to an XM station, and I have a background screen showing versus the normal screen, and I turn off the vehicle, when the vehicle is restarted, the XM is set to station one, and there is no XM service; other than the XM commercial, you get before obtaining service.
If the radio is set to an XM station, and the display is showing the normal screen (preset buttons, XM display, etc.), when I turn the vehicle back On, it goes right to the station that was playing when the vehicle is turned Off.
I duplicated this a half-dozen times at lunch. I have to think there is a bug in the NAV
Do not feel it is a wiring issue, but a software bug in the NAV unit.

Anyone else with the Z1 have this same problem?