I have the hub v1. Last week all of my Cree bulbs stopped working. Everything else seems fine. The Cree bulbs are zigbee bulbs, which I thought might be the problem. But, my other bulbs are zigbee too and they are working fine.
I’ve tried disconnecting the hub numerous times and, also, disconnecting the bulbs to no avail.
OK, after mulling over what I thought the problem might be I decided it was most likely the bulbs. I spent a lot of time trying to get the bulbs to reset and was finally successful with one out of four. Two of them I was able to blink, but they would not rejoin the hub.
I’ve concluded the Cree light bulbs just plain suck. I’ve seen the complaints on this board about getting them to sync. They are not worth the hassle.