Hi.
My setup is that I have a Smartthings Hub 3.0 & several FirstAlert ZCOMBO devices that were all purchased around 7 years ago in 2019.
I recently changed up my network & replace my old router w/Xfinity XB7. After I upgraded my network, my ZCOMBOs kept showing up as offline in my hub.
When I reset the Hub to factory settings, I get the ZCOMBOs back for several hours, but eventually they go back to going offline. I’ve tried it several times & every time it works, but only for several hours.
Any suggestions?