I'm sorry to hear that you're getting picture and sound disruption on the BBC 2 channel. I will check this out for you.
I have taken a look and there is a signal fault that I can see. It will require an engineer to call round and fix for you. I will send you details in a private message, look for the envelope icon above.
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Technician came and definitely made an improvement to signal and the cracking up did not occur that evening. He found a loose connection which when fiddled with, created the symptoms I have been experiencing
However there were a couple of instances of it happening last evening (March 17th)
the situation has much improved but occasionally but I am still experiencing occasional cracking of sound and a stutter on vision. Two nights ago this was quite evident on BBC 2 in the evening so I switched to looking at the same channel live on BBC iPlayer through the wi-fi signal. This was perfect.
Not sure if this helps but I will keep looking and report back next week.