Black TV screen after watching a recording.

[Akita]

When I watch a recording and finish, the TV screen goes black.
Then I have to change to a different channel than the one I was on to get a picture again.
Is this wrong or should I finish in some other way?

 

[Akita]

I have tuner A connected and tuner B not connected.
Then I have connected receivers C-H.
Will it be better if I connect B as well.
Is it possible to use a slitter?
One input to two outputs.
A splitter probably changes the SNR strength.
As it is now, Signal finder shows about 73%.

 

[Akita]

I have also noticed that when starting Vu+ there may be a black box.
No SNR is displayed.
If I change to another channel the picture comes.
Then I can go back to the previous channel.
I have never had this when I used select LNBs.