Hi I bought a Zgemma box for use with vermin problems at the start but they have mostly been fixed. One issue still a bit of a bug I am getting occasional picture freeze. This only happens at random times never lasts very long but it can be a bit of a pain if it happens at the wrong time during a Tv show. I have been told it may be fixed completely if I put an attenuator on the cable leading into the back of the box. My question is what size attenuator do I fit.On my router there is a 4db forward path any help would be great TIA