We used Unifi to install Wifi in a house for a customer. Originally we covered everything with 5 UniFi AC PRO versions of the Unifi access points.

There are several VLANs, one for the office/staff, one for the reception one for another company using some rooms in the same building and one for the guests. This ran for two years relatively without issues.

However guests complained, that in the rooms there was always bad Wifi coverage. Therefore we ordered 20 UniFi AC Lite versions and installed one in each room. While that improved the coverage, we now had guests complaining, that they had connection drops and difficulties to connect to the internet at all. They would be able to associate with the AP in their room but then the connection to the internet didn't work.

To investigate the problem, I installed a monitoring system (Check MK) in their network and added all APs via SNMP. There I saw that alot of the VLAN interfaces of the access points suffered lots of errors. These happened seemingly completely random. I since then removed all VLANs from the Lite APs and only left the guest Wifi open. However I still see the errors coming in. Some have a few percent out-errors, some have up to 100%.

It's always the same interface (the one providing 5G Wifi).

What could cause these issues and what could I do to further investigate the problem?

We used Unifi to install Wifi in a house for a customer. Originally we covered everything with 5 UniFi AC PRO versions of the Unifi access points.

There are several VLANs, one for the office/staff, one for the reception one for another company using some rooms in the same building and one for the guests. This ran for two years relatively without issues.

However guests complained, that in the rooms there was always bad Wifi coverage. Therefore we ordered 20 UniFi AC Lite versions and installed one in each room. While that improved the coverage, we now had guests complaining, that they had connection drops and difficulties to connect to the internet at all. They would be able to associate with the AP in their room but then the connection to the internet didn't work.

To investigate the problem, I installed a monitoring system (Check MK) in their network and added all APs via SNMP. There I saw that alot of the VLAN interfaces of the access points suffered lots of errors. These happened seemingly completely random. I since then removed all VLANs from the Lite APs and only left the guest Wifi open. However I still see the errors coming in. Some have a few percent out-errors, some have up to 100%.

It's always the same interface (the one providing 5G Wifi).

What could cause these issues and what could I do to further investigate the problem?

EDIT: All APs, Switches and Controller components are on the latest version. Each IP also has got assigned a static IP in their management-network.