hey dude, how did you find that? Maybe you can post the screenshot of the wireshark capture?

hey dude, how did you connect the device? Is it like this: PC-----switch----printer?

Hey dude, I have not met the problem you mentioned, but I want to know how did you find that there is still traffic passing through? The problem you described looks like a switch hang problem. And...

hey dude, I suggest you contact TP link support, they will help you on this specific topology

hey dude, I am not familiar with the Airport Express , is it a modem router with a DHCP function?If you tell me more details maybe I can help you ,thanks

hey dude, I suggset you contact TPLINK support directly for help