Hi @Kevin_Z 

The AP is Unifi AP - AC LR in bridge mode (UAP).

The router (including DHCP server) is Mikrotik RB911G.

Later on, I played a bit more with connecting RE305 v1 to the network and the issue may actually be dependent on how the initial setup is done.

During test, I had both 2.4 GHz and 5 GHz WLANs available on the same single UAP and sharing the same network xx.xx.xx.xx/24 from DHCP.

RE305 seems to behave differently with various setup procedure:

1. Quick Setup: Connect to both host WLANs and activate both 2.4 and 5 GHz client WiFi.
2. Quick Setup: Connect to only a single host WLAN (say 2.4 GHz) and activate both 2.4 and 5 GHz client WiFi.
3. etc with other variations.

It seems that the problem arise, when I use e.g. the procedure as per point 1 and then manually modify the settings (e.g. disabling 2.4 GHz host side and disabling 5 GHz client side; or even re-connecting to some other host WLAN). With some variants, RE305 is not able to obtain IP address from the router after reboot, although it seems to associate with UAP.

Using Quick Setup (instead of manual modification) to define any targeted variant of the setup (e.g. host side: 2.4 GHz on, 5 GHz off; client side: 2.4 GHz off, 5 GHz on) seems to work just fine: Then RE305 does not have a problem to get the IP from router. Subsequent modification of client side SSID name and or setting client side radios off/on still works fine.

So, let's consider this problem solved by 'using QuickSetup rather than manual setup'.