PVR - No sound after Fast Forward

[wireless]

I lose sound on PVR after fast forwarding through commercials. I've tried everything I can think of to fix (including replacing HDMI cables) but nothing works. The only way to get the sound back is to turn pvr off/on, or change the source to something else (e.g. Blu-ray), and back to tv again. It's driving me nuts. Has this happened to anyone?

Thanks
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