AGC affects the signal before it reaches the MPEG decoder - more gain means a weaker signal is coming into the box. If you're still getting picture freezing, I'd suggest a call to Faults tomorrow to get it checked out.
A better way to find out what's going on is the Pre- and Post-RS error rates - from broadcast TV, press Page Up, Page Down and then Blue on your remote control. Any Post-RS errors mean you're going to see picture break up, freezing and pixellation, and are likely to need an engineer to correct.
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Originally Posted by Rob2005
Out of interest, what is normal/the opitimal AGC level? Thanks.
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There's no "normal" as such, but lower is better. Optimal, I suppose, would be 0%, but that's practically impossible. More information on AGC is available from Wikipedia:
http://en.wikipedia.org/wiki/Automatic_gain_control