In-path appliance over forwarding capacity — inspection load is eating headroom; upgrade the box / reduce inspected traffic / add a parallel path.
Open the Security lens: this box's deep inspection (DPI/IPS/scrub) collapses its effective forwarding well below the nameplate ASIC rate, so it's dropping customer traffic transiting it.
Everything behind it degrades — size up to a box with more inspection throughput, bypass inspection on trusted traffic, or split load across a parallel edge.