Hi Gideon,
That's not the behaviour I've observed. If the live cache contains 30 minutes of a program that is still being broadcast it keeps that 30 minutes if you press the record button.
However if the 30 minute buffer has (say) 25 minutes of a prior program and 5 minutes of the current program, pressing the record button loses the 25 minutes and keeps (and adds to) the 5 minutes.
Perhaps in your example you just happened to press the record button just after a new program started. That would lose nearly all of the cache.
HTH.
Cheers, Dave.
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