DVB-S2 PROBLEM SIGN

I'm having problems with the frequencies dvb-s2 the signal comes and goes,
Dvb-s works stable.
I have linux 14.04 64 bits
Lnb quattro
PLEASE HELP ME
Dvb-s works stable.
I have linux 14.04 64 bits
Lnb quattro
PLEASE HELP ME
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