Given my limited understanding of how digital satelite TV works, I wouldn't have thought this was possible. i.e. you'd either get all channels fine, or have problems with all of them. However, it does ocasionally occur.
I don't think the weather is necessarily really that bad when this happens as well.
One issue that may be affecting this (although I can't really see how) is that around 6 months ago, we moved our TV and got sky wired to the new location. This involved replacing a two way splitter, with a three way splitter, running about 6M of cable and having a couple of wall plate/sockets. The issue may have only been happening since then, although I can't really be sure.
Anyone have any ideas around this issue? Any diagnostics or somethging that I can run?