3ASmart Home 3 Gang / 2 way Switch (NUE-ZB403B) - Hangs when I add to SmartThings Hub

Hi, I have had the above device for a while but something must have happened to my hub as the two I have two of them flashing - when I add back into my smart hub, they work for about 10minutes then hang (unable to press any light on - have to switch light power off at mains). I am using Mariano’s Zigbee Multiswitch and Child MC driver - does this have a code error or is just something I am doing very dumb to add these back into my hub?

Thanks
Andrew!