ISPs should do a lot of things, but when it comes to IPv6 many don't. Mine gives me a new prefix every time my router boots. Meanwhile I've had my DHCP allocated IPv4 for 3 years now...

Given that the IPv6 standard was written by enterprise network people with no thought how it would get deployed to the masses, lots of software is still a PITA to work with if you got an ISP like mine.