This sounds like something is interfering with VMs network signals. More than likely it’s a noise problem being caused by something either in your house or in the street. If the network is not watertight, due to a degrading connection or someone making unauthorised alterations to VMs cabling this can cause interference to leak in.
Heavy internet use does not affect Cable TV, which uses a broadcast system similar to Digital terrestrial (Freeview) & Satellite TV. But the fact that both TV & internet are affected at the same time is likely to coincide with something electrical being switched on.
Virgin BB TV Landline. Freeview/Freesat HD, Virgin Mobile, Tesco Mobile. Cable customer since 1993
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This problem has ceased, don't know why. It had continued every weekday last week and stopped at the weekend, complete mystery, unless VM have done some work to correct it. Next door neighbour had a similar problem about the same time.