Problem with Dreambox 7020 & image quality

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Dear all,

I have a Dreambox 7020 with a dish pointing Astra and Hotbird. As I had (and still have) I ask a professional to came to set and point the dish perfectly. He came did the work and check the signal at the dreambox. Signal level is perfect.
The problem I have is that randomly I have some "squares" on the picture. It doen't appear each 10 minutes or 10 second, just randomly. The fact is that when you are looking at a movie it "s...s"...
Do you thnik that it may come from the drambox or from the cam I'm using (gbox) ?

Thank you in advance for your opinions..

Best regards

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Hi...
Ok, thanks for the info. I get "blocks" whatever channel I look at.
My dish is a Visiosat BiSat, with two LNBs INVERTO Universel Twin.

[daBimbo]

I had the same problem on my SS2 the last couple of days. I had it only on Astra, and from tiem to time I has sound but had a forzen picture . . . this wnet up to that point that on Astra the horizontal polarozazion didnt' work, then later Astra didnt' work at all. The problem for me was in the diseqc switch, I had to remove it so I'm back on Astra only