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Thanks.
I think I found a reason for this behavior :
As soon as the TV started, an external device
kicked in and switched the TV to one
of the HDMI inputs. I changed it and now the TV seems to work
as expected.

I am using an UB 850 with firmware 5.5.55.
About 2weeks ago I started to have problems with the channel list :
channels got resorted, sometimes hidden, or just disappeared
Resetting to factory defaults and a rescan of all channels just helps for a few days.
What can I do ?
Thanks