Alan McKinnon <alan.mckinnon <at> gmail.com> writes:

> It's done it since new (which was recently) and nothing else changed.
> The XBox, tablets, phones and the missus' Windows laptop all show the
> same problem - so it's not Gentoo 

Alan,

Sometimes Rf issues that are peculiar and anomalous have a component
of the problem being poor grounding. Check your grounding as
here in Florida, grounding often goes out of spec (too high)
due to corrosion on the grounding rods over time. It's best to use 
a "triad" of grounding rods and test by "ohming" the ground
measurement.

Alas, and this really sucks, you may have a combination of
issues, particularly transient conditions where someone is
using a ham radio in your area or such, or some neighbor
that is using a welder. Those sorts of noise/power distortions
are sometimes impossible to pin down. Long the drops and see
if some patterns of recurring time stamps are present...
Some "dirty" power supplies that are found anywhere downstream of
the (power) distribution transformer can "wig out" Rf power supplies
quite easily.


hth,
James






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