Over the past 10 days or so our local power grid has been having a few issues. Our street has had 2 power surges (everything off then back on in a second or two) and then one prolonged outage that lasted for an hour or so.
Since then, my broadband DL speed has dropped from an average of around 40 MBPS to around 12 MBPS.
It's still perfectly usable but obviously I'd prefer to have it running at full whack!
I've tested with 2 different routers & different filters but the speed remains the same.