PLEASE IGNORE THE MODEL SELECTION - I HAD TO CHOOSE ONE AND MY WIRELESS AP WAS NOT ON THE LIST

I've just installed a TL-WA1201 wireless AP into my home network and wish to use it's multi-ssid feature to broadcast 3 different ssids for the 3 VLANs set up on my network. I have it set up like this:

SSID 1 (2g+5g) - VLAN 20 - IP address 10.0.20.1

SSID 2 (2g+5g) - VLAN 30 - IP address 10.0.30.1

SSID 3 (2g+5g) - VLAN 40 - IP address 10.0.40.1

The issue is when connected to any of the 3 SSIDs devices get intermittent packet loss and I've not been able to find the cause. Things I have tried:

- Loading webpages - about 80% of pages won't load

- Pinging 1.1.1.1 - results in 30-70% packet loss

- Pinging google.com - results in 30-70% packet loss

- Pinging default gateway - results in 30-70% packet loss

- Connecting to every SSID with multiple different devices - issues persist

- Changing ethernet cables - issues persist

- Swapping from PoE injector to direct power - issues persist

- Connecting physically to each vlan with ethernet - no packet loss or internet issues whatsoever

Everything points to the TP link AP being faulty but before I return it I wondered if anyone here had any ideas?