Disappearing 5 ghz band
This morning, I planned to go do some network debugging at a friends house, and I pulled up iStumbler just to test.
What do I see? Only the 2.4ghz band of my Amplifi is broadcasting! I took a look on all my devices in the house and they were all connected only to 2.4.
I rebooted the Amplifi (it had been up for 60 days) and low and behold, the 5ghz band returned, and my devices all switched over.
I have just the Amplifi HD, no mesh endpoints.