To be sure that the AP’s have a proper Internet connection and no error/packet loss, is it possible that the AP itself do performance checks to some measurements hosts on the Internet ?
This could help to see if one AP has a bad connection (faulty cable or switchport).
As an ISP engineer we let our CPE’s do ping tests to some measurements host in our own netwerk (Or the classic ping 126.96.36.199/188.8.131.52).
Next to that we have an option to start a speedtest that is triggered from the CPE to our own 100G speedtest server. This gives us a clear view what the maximum capacity is of our uplink connection.
In the Alta case, this could help to see what the maximum backbone capacity is of the AP…