Thank YOU!!!
You were absolutely right. The aumox switch was dropping frames. I am now using
TP-Link TL-SG1016PE V3 , 16 Port Gigabit PoE Switch , Easy Smart Managed , 8 PoE+ Ports @150W , Plug & Play , Sturdy Metal w/ Shielded Ports , QoS, Vlan, IGMP & LAG , Limited Lifetime Protection...