Two sec CQM down/up blips in clueless?

In the early hours of the last few weeks, on occasion I’m seeing line down/line up ‘blips’ reported in clueless. Duration is approx 2 secs. This is so ridiculously short that it cannot be a DSL down-up loss of sync, as this would take about 70 secs with my modems. I have three bonded ultra-long ADSL2 lines: [email protected], .2 and .4.

This is the latest reported one:
Today 02:22:17 Sent KCI email [email protected] 2022-05-15 02:22:14 DSL line up (down 2 seconds)

Any idea what’s going on?

You should remove your email address.

I would suspect this is just some maintenance taking place overnight somewhere which is causing a brief interruption. Like you say it's unlikely a resync if its that quick. A&A are updating some router firmware so maybe that was it. https://aastatus.net/42430

If it continues you could always check with them.