I recently disabled it on my router because dns would fail to work after a day or 2. When I did more research, it looked like others were running into the same issue, but there was no known fix, so the easiest solution was to disable ipv6 entirely.

I used to go out of my way to get ipv6 working (back when it was "new" I used a bridge service to get access), but I simply do not have the time to figure out what might be wrong with it anymore.