Updated to 2.4.2.125 and now Homekit isnt working at all, reset it, reset the hub, reset apple TV. Don't really want to pull it all off and re-add as i spent ages making all the rooms 
Platform Version
2.4.2.125
Hardware Version
C-7
Working on my hubs, so may be a local issue. Can we assume that there haven't been any network changes since the last time it worked for you?
Regardless, if you believe it is update related you can roll back a version to see if it starts working again.
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No network changes, working fine until update applied. Just rolling back now to see if it comes back online.
EDIT: Rolled back, no change unfortunately. Will try and continue to troubleshoot.
Working fine for me too still so I don't think it's the update.
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Try rebooting your home network router and any other network switches, access points, etc...
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All tried, checked in homekit under hub and its saying "this accessory is not responding" 
So, I think I worked it out. It was due to being on a different subnet which has been working fine for the last several weeks. Changed over and now working fine.
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