Recently, my 2003 XKR is talking about on-board electronics. However, only after a short journey time (times after 10, times after 30 minutes): The error message “Tempomat not available” and the yellow warning bar appear. Except the cruise control everything works perfectly. Since this is a sporadic error (at the beginning of the journey the cruise control still goes), I hope for a curable suffering. Who can help or has an idea?