In article ,
Jeff Liebermann wrote:

Much depends on the device causing the problem. It's often cheaper
and easier to just buy the owner a new device instead of trying to fix
it. I've done that a few times with Chinese junk that never had a
prayer of meeting FCC Part 15 incidental radiation limits. So far,
I've replaced one ethernet switch, one 4 line phone, and 2 security
cameras in the neighborhood. Also, a mess of junk switcher type cell
phone chargers.

*rolls eyes*

A few years ago I helped chase down a noise source which was wandering
randomly through the 2-meter repeater input sub-band, and causing
prolonged noisy squelch tails on the ends of transmissions on several
different repeaters in the Silicon Valley area. It turned out to be a
(famous name) 5-port Ethernet hub, which was leaking its internal
clock-oscillator signal into all ports and back into its power supply
and was "turning the entire home wiring into a giant antenna" (as the
house-wiring-TV-antenna gimmicks used to say, decades ago).
Horrid... I could practically hear my spectrum analyzer cringe.

The owner was extremely cooperative, immediately agreed when I offered
to replace the hub with one from my own collection of spares, and the
problem went away and hasn't recurred in the years since. An unusual
failure mode, I guess (fortunately!)