This is a very curious problem. Although I don't use sky, I do use the satellite feed for my FreeSat box. I haven't had any problems even when it has been very cold. That said not all of the channels work but I understand this to be something to do with a local microwave signal interferring or because of the particular satellite we point too.
There is one other common variable with these reports, namely using Hyperoptic as the ISP. I am wondering if there is a geolocation conflict occuring. I noticed that some websites detect my IP location as being in the US, due to Hyperoptic using recyled US IP addreses. It may not be this but I wonder if there is some other conflict brought about by the combination of sky / hyperoptic. It would be interesting to know if other non hyperoptic / sky users have experienced any problems. Just an idea.