Bad latency since 24 Sep 2025 - Clearly visible in BQM

Something happened with my connection on 24/09/2025. Since then I've had horrible latency every evening after 18:00 with higher packet loss during that time. 

Something has clearly changed in the settings or local network as it's really visible in the historic BQM data.

This is on a Hub 5. Currently on 1 Gbps package - not anywhere near that in speed either. Modem is already in modem only mode. Can post other relevant info from modem. 

Current live BQM

https://www.thinkbroadband.com/broadband/monitoring/quality/share/39f70be639ee3e8148d1e77ee218f083723b8058