I noticed a possible bug today regarding the IPv6 DHCP Client on my RB750G (exists in v 5.16 and 5.18):

DHCP-Client was searching for IPv6 address on WAN interface with a /64 prefix. I realized my ISP was handing out /48 blocks instead, so I changed the prefix to a /48. The changing of the prefix seems to cause the IPv6 dhcp-client to hang and CPU load goes to 100%. I must reboot the router to return to a normal state.

Anyone else have this problem?