Considered a longer timeout for the echo timeout?
if the VDSL is staying up, then suggests not an interference issue, but differences in how FTTC handles things and getting your Linux box to play nicely.
The joy of using one of the non-standard routers is getting it configured just right.
If this was me I'd be ditching the Linux box for a few days to try another router and see if things are stable, before pestering ISP. www.sinet.bt.com may detail the spec for LCP timeout



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RobertoS