Hue Lights not reporting status accuratley

All of my Hue lights stopped working properly about 2 days ago. In the Hue app they all show as “light may be unreachable” (red circle & exclamation mark).

The lights still turn on & off manually, but the Hue hub can’t control them, so neither can SmartThings or my Amazon Echo (which I only have use SmartThings to control them through anyway).

I did briefly get the lights working again this morning after multiple reboots of the Hue hub and attempts to change the ZigBee channel…but they only worked for a few minutes until they all went “offline” again.

Everything has been working fine for about 3-4 weeks, so it’s very strange that this problem has started to occur. If it were a distance issue, I’d’ve expected the problem to occur immediately.

Very strange. I’ve been getting some attempts at help via the Hue Facebook page, but no solution.