What version of WLC are you running? What kind of access points (1500 or 1520) are these? Have you configured any BGN on these aps? What is signal strength between the ROOT AP and the MESH AP and between the backup ROOT AP and MESH AP? What channel are these ROOT aps on?
We are using LAP1520(latest WLC version) and they are configured automatic power and channel set.
We have an another problem with LAP1520 and AP1242 bridge mode AP(IOS based). the AP1242 bridge AP(using 2.4GHz link to MESH AP)is connected to IP Camera ethernet interface, somtimes the video was disconnected. Is this problem caused by RF interference?