I recently updated my firmware to ASUS latest version, and within a day the 2.4 stopped working. It seems like it's fine from everything I can see in the router app, but none of my devices can see it. I tried installing the latest merlin firmware but it seems to have not helped any. The router is probably 6 weeks old. The only thing I noticed is that the temperature on the 2.4 spikes somewhat wildly between 125f to 156f every other second or so.