I have a reproducible bug where enabling QoS on my Archer BE700 destroys my internet connection rather than managing it.

Hardware: Archer BE700 v1.0 Firmware: 1.2.2 Build 20251027 rel.47412 ISP: Spectrum (Austin, Texas, USA)Internet plan: ~620 Mbps down / ~32 Mbps up (measured with macOS networkquality)

Issue:

With QoS disabled, my connection performs as expected: ~460 Mbps down, ~33 Mbps up, Medium responsiveness (~247 RPM, ~240ms under-load latency).

When I enable QoS with Download Bandwidth set to 560 Mbps and Upload Bandwidth set to 29 Mbps (90% of measured capacity, which is the standard best-practice setting for SQM configurations), the router does not gracefully shape traffic. Instead, my connection is crippled:

• Download drops from ~460 Mbps to ~5-13 Mbps
• Upload degrades
• Responsiveness drops from ~247 RPM to 16-18 RPM (Low rating)
• Under-load latency balloons from ~240ms to 3+ seconds

This is reproducible every time I toggle QoS on.

Disabling QoS immediately restores normal speeds.

Expected behavior:

QoS with a bandwidth cap slightly below measured capacity should reduce bufferbloat (improve responsiveness under load) with minimal impact on raw throughput. Instead, enabling it catastrophically degrades the connection.

What I need:

1. Confirmation this is a known bug or that my configuration is expected to work
2. A firmware fix if this is a known bug
3. If there's a specific configuration that makes QoS work correctly on this model, please share it
4. Information on whether upcoming firmware releases address QoS behavior on the BE700

Happy to provide additional test data, speed test outputs, or logs if helpful.

Thanks, Ben Daniel