I had a similar problem with 7 tv's and a bunch of splitters. Most of the sets worked fine, but the ones in the kitchen and bedroom would frequently have the picture freeze for a second. I figured it must be signal loss, since these two sets were the farthest away by cable length and were at the end of several splitters.
I solved the problem with two items purchased through Amazon. The first was an eight port distribution amplifier for about $35. This eliminated most of the splitters and provided a solid signal to each device.
The second item was a bag of "terminators". These are just a small resistor enclosed in a screw-on cap. You place one on each unused port of a splitter or amplifier. I was told that this prevents unwanted noise from entering your cable through the open splitter ports. They're cheap and do seem to make a small difference.
I also found a corroded splice in a damp spot. I replaced the two connectors and the barrel connector and used rubber tape to waterproof the whole thing.
My television wiring is now in top-notch shape and if they ever broadcast something worth watching, I'm ready...
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