latest XB8 firmware website?

Recently three of my IOT devices begin working, intermittently. They drop off the network randomly.  Some days two will drop off, other days, one will drop off.  Other days, all three will drop off. They all will show up again on the network. These devices control lighting in my house.  I have a Apple, home network, but they are not dropping out of just Apple, home. They’re dropping off of the Wi-Fi connection, so that even the parent app for the company does not work.  Nothing has been added, or removed from the network.

Thank you for clarifying that @Dendros! Are other devices in the home also experiencing this issue? Have you noticed if all devices lose connection at the same time?

Other devices are not experiencing the same issue.  These three devices are all tied to remote light switches.  They all intermittently lose network access.  The firmware for the switches has not changes in about 6 months, leading me and the lighting manufacturer to believe it was a change with the router firmware.