I don't think it is related to ipv6.
I just give it try. But now It's already running from 09:45 Hour till now .. Whitout freeze. That's already long. But I need to wait Hours to be shure.
What I well did is very fast zapping after channel selection before the box had time to display channel already jump back to select another channel or jump to menu button.
Before it after a couple of this impatient actions it freezeed straight away. Now with ipv6 removed it seems to support this actions
Weird I know But ...