Is this happening only on, say, live TV? Or is, say, OnDemand, recorded programmes and/or streaming also affected?
They're all handled differently within the box, and therefore would indicate different issues.
If you're getting picture & sound drops on live TV, I'd expect to see an on-screen error message if this was caused by the live TV feed from VM. Otherwise, I'd be looking down the HDMI connections route - this would likely affect all content, not just live TV.
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This happening on live feed television and I have checked hdmi cables thinking it was that. But I have changed televisions as my old was on its way out decide to upgrade and buy a new one and everything was ok for five days then it's started happening on the new television that is why I am thinking it's the box.