Issue with streaming sites, namely VUDU
I have recently switched from a MikroTik RB4011iGS+RM and Ubiquiti UAP-AC-LITE-US behind a ATT Uvserse 5268ac in DMZ+ mode to a TL-ER7206, TL-SG2008P, and 3x EAP620 HD. I have a very simple network configuration. No VPN, no VLAN, no open ports, no IGMP, and 1 network SSID. The controller is running on a Windows 10 PC x64 with an Intel 4670k and 16GB RAM.
After installing the new system I had serious issues with streaming services buffering frequently or not connecting at all. Speed tests reported >700Mb/s both up and down. It was especially bad when attempting to Chromecast from a Pixel 4 to a Vizio P75-F1. However the buffering would happen on hardwired PCs, phones, and TVs. Some services like YouTube seemed to be fine, but Vudu was especially bad and the connection would actually fail after streaming for some time. I have upgraded the ER7206 to the latest firmware and the issue actually got worse. Devices appear to have solid internet connections at all times.
Last evening I switched the ER7206 out for the MikroTik RB4011 and had no issues streaming content. Any suggestions on how to debug this?