After months of my line being rock solid it now seems to be dropping each night (at various times) but the speed seems to be moderately stable (it's dropped from 55M to about 49 but now seems to be bouncing either side of 50 when it reconnects).
The logs ( its a Archer VR600 v2 00000000 ) show things like
2021-05-05 01:09:57 [5] System: DSL Link Down
2021-05-05 01:09:59 [5] System: DSL Training G.994
2021-05-05 01:10:04 [3] PPP: ppp1 User request
2021-05-05 01:10:04 [3] PPP: ppp1 LCP down
2021-05-05 01:10:04 [4] PPP: ppp1 LCP down
2021-05-05 01:10:04 [6] PPP: ppp1 sent [LCP TermReq id=0x3 "User request"]
2021-05-05 01:10:04 [6] PPP: ppp1 sent [LCP TermReq id=0x4 "User request"]
2021-05-05 01:10:09 [3] PPP: ppp1 User request
2021-05-05 01:10:09 [3] PPP: ppp1
2021-05-05 01:10:09 [5] System: DSL G.994 Non-Standard Info Received
2021-05-05 01:10:09 [5] System: DSL G.994 Non-Standard Info Received
2021-05-05 01:10:10 [5] System: DSL Training G.993 Started
2021-05-05 01:10:18 [5] System: DSL Training G.993 Channel Analysis
2021-05-05 01:10:19 [5] System: DSL Link Up us/ds 7241/49179 kbps Type PTM
Nothing has changed in the house, so I'm wondering if its just down to the weather or if there is something else going on as those error rates are a lot lot higher than they were before.