Something wierd just started happening to just one channel on my digital cable. I have a cable splitter with the cable coming into the splitter and three outputs. -4db. -8db and -8db. I am only using the two -8db outs. When the splitter is inline, channel 106 is either blank or has large pixilixed boxes. When I take the splitter out all is fine. This just started happening. Would a signal amplifier fix this issue? What should one look for in a signal amp?