Hi to all

I'm a "new dreambox user".

I have an DM600-C with ****** 420 image (******-420-dm600pvr-200712172013)

I have connected the DM600 to my TV through Scart connection.

Now when i turn ON the TV, it's always on EXT (Scart) channel and this could be ok.
But if the TV is turned ON, and I turn off the DM600, switch to an another channel on tv, after some seconds the TV turn back on EXT (Scart) channel by itself.
This is nerve-racking.
What it can be?
Someone can tell me if it is possible to do something to remove this behavior?

PS. A friend with a DM500-C has the same issue. I think he has also the ****** 420 for DM500

THX
Stje