Hi and welcome,
The BBC have done nothing with the signals since they moved channels around their transponders last October / November. And technically the BBC cannot do anything in relation to "weakening" the siganls, as the signals on that particular satellite are pretty much fixed (when the satellite was made), and it is under control of the satellite operators, SES Astra, not the BBC (or Sky for that matter!)
It may mean your dish needs to be realigned, or the LNB to be replaced (more than liekly to be the former). The only issue that I cannot do anything about, is if there is any (local?) interferance from other transmissions....
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