you fibre - ipv6 problem

hi

have been using you fibre over 12 months with ipv6 enabled on pfsense, opnsense and lately a udm SE - all seem to work fine up to a couple of weeks ago when I had an outage overnight affecting wan connectivity. Since then I am finding ipv6 keeps dying after enabling on my lan side after 3-4 days from having to re-enable. My lan chugs to a halt and windows clients for example totally lock up or struggle to respond. One example is outlook wont load or when it evenutally does its unable to sync for mail.

I have tested all 3 routers and my lan side of the network seems to end up with the same issue. By disabling ipv6 at the router everything seems to come back to normal once the issue starts.

all a bit odd as everything has been fine up till 2 weeks ago. Just wondered if anyone else is having any issues with ipv6. I havent changed my config prior to or after this started.

I have now got a ticket open so waiting for further feedback.

thanks