Solved
I have a Konnected Alarm Panel 2 with a single Alarm Panel 2 Add-on. Recently, the Alarm Panel 2 Add-on has been having connection issues with the WiFi. It connects to the network for a few seconds and then disconnects and goes into pairing mode. This is new behaviour and it was working for the first couple of weeks. I have one other AP that is further away so I disabled that in case it was getting confused but it still has the same issue. The Konnected Alarm Panel 2 has no issues connecting and staying connected.
Is this a hardware issue? What other troubleshooting can I do?
Embedding the video didn't work but here is a screencast showing the connection issue. Notice, the other board has no issues staying connected and they are right next to each other and LoS from the router.
https://youtu.be/Mn2bbvMCP7w
I held down the reset button for 30s. The device then connected and has remained connected for 2hrs now. Thanks for your help via email Andy!