After testing a lot the problem still remain.
Let's see if looking at my configuration we can clarify something.
The MIS satellite I see is Eutelsat 5ºW
Down 2 cables of 4 twin LNBs, with Diseqc
like tuner A, it is not for MIS reception, it necessarily goes to tuner I (I have the preferred tuner on automatic)
Simple setup, Diseqc A/B/C/D.
5ºW is in position C, but only in Tuner I, in Tuner A position C, it is as not configured
Hope this can help you
However, I seem to remember that I ended up returning the Tuner I and J. Because it continuously pixelated. They sent me a new one, with which there were no pixelations.
Although I sold the receiver later (with the new optional tuner)