Tradfri bulbs interview failed

Had a power outage mid week.
When it came back on my 2x tradfri E14 470 lumen bulbs stopped responding totally.
So I removed them both from z2mqtt and attempted to re-pair. No issues getting them into pairing mode but I get ‘interview failed, device not paired’ every time now. I’ve tried everything I can think off, restarting Z2MQTT, un-pairing & re-pairing another bulb on the network (worked fine) and restarting home assistant
Hopefully someone can help, I know these bulbs can be tricky but this is a nightmare and I can’t see a reason for it, everything else came back to life fine after the power came back