Hi there had one of my collegues with a problem today. They had installed a new power point in a bedroom and ran the decoder off this PPT they discovered that when they turned off the decoder in the bedroom that it momentarily affected the sky decoder in the lounge. The decoder would loose signal for about 15 - 20 seconds before comming back. I did a bit of testing and it seems that they have had this issue from the word go. The only thing I can think of is the LNB is getting its 18v feed from the decoder in the bedroom and when it is switched off it then gets its feed from the sky decoder in the lounge the latency could be due to the decoders being two different types one is the old motorola (bedroom) and the other is the later silver ones (lounge). I dont think it is the 2way splitter as it is a matchmaster all ports pass and they are very good splitters. I have done a lot of SAT work and have never seen an issue like this before.
Hope someone can help just wanting to increase my knowledge.