'Push' signals failing

I have a buzzer and some relays on my Konnected.io to signal alarm state change and to open garage doors respectively.

It all worked well for a number of months.

Now the buzzer and the relays don’t respond to the triggers they did do previously. Signals from the same boards continue to be received by Smart things, sensors report perfectly but the buzzer and relays don’t respond.

This happens before, I deleted all the boards and started again to fix it.

I was hoping there was a less drastic fix as I have a lot more boards now and was looking for a fix rather than a rebuild.

Any ideas?