Doesn't look like anyone else is seeing this but I've effectively lost my internet. Looking at my router it keeps establishing a PPP session (IPv6 'n all) then the remote end terminates the session. Each session is lasting about a second.
The DSL light on my aging HG612 seems rock steady so I don't think it's a line fault.
I've notified support and someone should be able to look into it further tomorrow. It's a new one on me :(
There were reports of a few issues over the last couple of days here:
https://www.idnetters.co.uk/forums/index.php/topic,33865.0.html
It eventually cleared up around 11pm after I'd gone to bed.
https://forums.thinkbroadband.com/idnet/t/4641742-dropped-sessions.html
I notice on the IDNet status page there are a couple of faults listed but my exchange isn't on any lists and the times don't coincide.