@David78907 have exactly the same issue. Engineering looking into it apparently but will likely look at another brand if this can't be fixed. Can't roll back firmware after the last update either. So...

@Joseph-TP I'm also on 1.4.3 Build 20250813 rel.63911(4555) and have noticed a huge spike in latency when enabling QOS. Seems completely broken. Firmware Version 1.4.3 Build 20250813 rel.63911(4555)...