I honestly don't know how far I am from my phone exchange. As to time of day ... not really. It's as intermittent at 7:30am as it is at 8:30pm, 1am or any time in between.

I haven't done the thing with the microfilters or the master socket (how do you test from the master socket anyway?) but the microfilter thing was next on the list of things to try. Thanks!