I used to experience the same issue with the backhaul reverting to 2.4Ghz. I changed the Backhaul to the wireless settings in the screenshot, factory reset the mesh node and rejoined. I haven't had a problem in months now and it's been working really great.
Although I agree that we shouldn't have to factory reset for an upgrade, I did before I updated to the latest stable build on two XT8's and couldn't be happier.
If anyone is interested, I have a new beta from Asus. I was experiencing random internet connection drops that a power cycle fixed. I have been using the Feedback tool in Administration and they have been listening and responding to me. I've very happy with the support I've been receiving. Of...
25513 is working great for me with one exception. I cannot connect to my employer's VPN with Cisco AnyConnect where the earlier firmware versions I could.
Going back to my issue with my mesh point constantly disconnecting. I was given an RMA from Asus Support but I declined it and said I will wait for the next firmware update. This past Thursday, they sent me a beta firmware that's slightly higher in version number than the latest firmware today...
I have already fully reset the mesh point. I see no reason to reset the main right now as it's working perfectly and I really really don't want to re-enter all my config manually.