Not sure, but I suppose stand-by is not enough (to reset), you might need to unplug it from the mains.
Ralf
PS: Sure an expert will help with better details soon. My idea is just... an idea.
My Beo: Beosound 3000, Beolab 4000, Beo 4 DVD, Beolab 5000/Beomaster 5000, Beovox S45.2 with Stands, Beosystem 7000 black with Beolink 7000, Beolink 1000, F1000 (3 cubes), Beovox 5000, Beovox 3000, Attyca 1.