I carried on having a play, trying to work out what I could do with the misbehaving switches. When they were flashing, whilst they were still controllable they were not sending any info back to the controller
So…after faffing around for a while…i tried removing one from the network, then factory resetting and adding back in…which so far appears to have done the trick.
I’ve repeated this on the other two now…so lets see if thats cured it