No sound on start up

Hi
We have been on holiday recently and while away my youview box updated. Since then when switching the box on from standby and switching on the tv I do not get any sound. If I then change channel the sound comes on.
Has anyone else got this problem or does anyone have a cure
Thanks

Yes a couple of times, not sure if the last couple of updates have been 100% successful.

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No sound on start up

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