Ossidon and Aureliax spawns broken/server hitch?

I'm playing on single player Xbox and every so often I'll get server hitch alerts for snow dragon and snow monster. Additionally, I have only had an ossidon spawn once and aureliax spawn twice since launch. Is anyone else having this problem? Is it a console thing that I have to hope for a patch? Or is there something on my end I can do aside from force spawn one in? Thanks!