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Disconnects and Sustained High Latency

Hi all, 

I am experiencing periodic but sustained disconnects (my router says "VDSL disabled" then tries reconnecting, and the diagnostics fail at "PPP Server Connection"). 

Even when connected I experience 2000ms+ latency for sustained periods of time from the Default Gateway. 

Here are typical pingplots for the disconnects: Capture2.PNG

And for the sustained high latency: 

Capture3.PNG

As you can see the issues start at the Gateway.

I am using a TP-link router / modem. 

I have used the BT automatic diagnostic, which says there is no line fault. They also say there is no SLA for latency or for disconnects (and I have no speed issues so therefore I can have no complaint).  There is no noise on the quiet line test. An OpenReach engineer called (but I can't have him access the property due to covid) and said there was no problem with line outside which was stable; however the frequent disconnects and crippling latency spikes make working from home next to impossible. 

Any suggestions? I don't think it's my router, but if it could be solved with new equipment or settings I'd be delighted.

Thanks all! 

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