@David_B4 Sounds like you might have another device providing DHCP. Can you share your network topology? Any chance you still have an old router or unmanaged smartswitch in the mix? If you are...

@PietroC FWIW, the official TPlink notes say you should be able to go straight: If you are upgrading from controller v3.x, it's highly recommended to upgrade 3.x to v4.1.5 first, then v4.1.5 to the...

@2525rentcar I should probably have asked why that particular topology to make sure the router will do what you want it to.

@PietroC I do not know for sure, but to be safe, I'd recommend going 4.4->5.0->5.7->(5.8)->5.9.31. Pretty sure 5.0 and 5.7 are needed, not sure if you need to hit 5.8 on your way to 5.9. If you have...

@2525rentcar Try making the PC2 IP (10_168_100_100) the DMZ IP for the ER605.

@sr0001 Are you on the same radio band as you were before? Try creating a 5.8Ghz only SSID and use that for your Google Meet device and see if the lagging continues.