Picture breakup, if you've rebooted your box & checked your connections are finger tight, is usually indicative of a cabling or box fault causing poor incoming TV signal. It therefore needs VM to find the cause and rectify it. Buffering is a different thing.
Are there any particular channels affected, as this may help narrow down the cause.
It probably won't change the end result - you need to call VM and report the problem. 150 from a VM phone, or 0345 4541111 from any other phone, and follow the prompts for "I have a fault with my TV service". VM should be doing a few checks remotely to identify whether a box-swap or engineer visit is most appropriate - anythiing else is likely to be kicking the can down the road.
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