Add me to the list, too. This has been happening to me since Friday afternoon. Every once in awhile I can get one for a little while, but I keep missing my windows when the stables are ready. If the yeti spawn was more frequent I wouldn't be as concerned, but I need every 3 hours (level 6 stable) I can to try and get a yeti. When it stretches to so many extra hours to get it, it affects my ability to make the timed event.