If encrypted channel then could be down to timeout waiting for the next key. If FTA HD or both then think about doing a HDD check (fscheck) to see if there are some errors on the hdd that need fixing. On ATV I seem to recall there is an option available to do this via the blue button. Basically you need to find the 'Device Manager' and do a File System Check. Else do an FScheck via Telnet.
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