the extension could have a bad connection.

do you have any new devices that have not got filters ?
do you have to many filters ?

how many points in house how many filters ?

Only the one filter which was what I used in the other room

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It's at the corner of get a map, and fuck off

Filters can die over time.
Had 2 fall apart on me over the years.

Can you put the Bob back in the other room, like it was before and see what figures you get.
I've seen some work where phone lines have been installed by twisting cores together and wrapping up in insulation tape, this is not the proper method for terminating data/voice cables.
Might be worth while getting up into the roof and seeing what work has been done and how it has been done.

If you have a new phone cable, e.g. 2m length that normally comes with modems, try giving that a go.
Also had a couple of cables die on me

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2015 Forester XT Premium
2020 VW Tiguan Allspace
teejay: If I wanted a comeback Id wank in front of a fan