I've noticed that there's a few non-RF releated settings in the ePMP UI that will drop the RF link when a setting is applied. Here's just a few of the ones I've noticed... Changing anything on the QoS page drops the RF. Changing Max TX power from AUTO to Manual and back drops it. Changing DNS settings on the network page drops RF.
There are dependencies between the wireless interface and ethernet interface due to the various QoS and networking features. The Aux port adds another level of dependency and complexity (not to mention the VLANs, Seperate management IP, Mgmt acccess through wireless and ethernet etc.). Hence some of the changes need a restart of the drivers (both wireless and ethernet) to bring them up cleanly taking into account all the dependencies.