DM 900UHD - DVB-C NOS Portugal - Problem on some HD channels

    Hello.
    I've got DM900 with DreamElite image installed and Oscam running receiving lines.
    All OK including most HD channels.


    But on some HD channels the picture gets squares all over.
    When i see the signal strengh is about 60%
    On working channel the signal is about 90%.


    Why the signal decreases?
    I think this is the problem, but i cannot find a way to fix it.
    Help needed.

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