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The same for me.
After a restart, DHCPv6 is stopped, no prefix delegation. At some point, out of nowhere, DHCPv6 and prefix delegation are running and all devices have IPv6 addresses. But this only lasts for a limited time, after a few hours the IPv6 disappears again. Restarting only leads to DHCPv6 being stopped again. Unfortunately, 24.7.6 has not changed this.

> I have the same problem since 24.1.10.

Ok but just no. The change being discussed wasn't on 24.1.x.


Cheers,
Franco

So it's no surprise that my problem is still there  :(

After less than a day my VLAN interfaces loose the public IPv6 address and the DHCPv6 server is stopped and cannot be started again. The IPv6 subnets for the interfaces are generated from the dynamic /56 subnet which I get from my provider.
I cannot find any errors in the logs (or I don't know which log file is the right one). The only fix for this problem is a full reboot, sometimes I need to reboot twice to get it working again.

I have the same problem since 24.1.10. I'm loosing the IPv6 connection after something between 20 hours and less than 24 hours and have to reboot the system to get it back. The upgrade to 24.7 did not fix this problem.

My provider is Deutsche Telekom (VDSL) with PPPoE / DHCPv6.

I've installed the patch mentioned above now and will check if this will fix the problem.