I'd suggest setting up a
BQM if you haven't already. My CityFibre based VF FTTP connection had an ongoing issue for a couple of weeks which was very apparent on the BQM graph - turned out to be a faulty line card on CityFibre's side of the network causing dropouts and severely reduced throughput.
Carl
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vodafone Gigafast 100/100 | Calix 801Gv2 GigaPoint ONT | FRITZ!Box 7530 Router