Once I got to the Winter Festival, the number of crashes I received increased significantly. To clarify, when I say 'crash' I mean it in the usual content, that is, the game stops and I'm returned to the XBox Main Menu.
(I'm being specific because I just made a bug report where the game actually locks up the console. To clarify this is a different type of error)
I have played through to the Winter Festival and while I have encounter a couple crashes, when I got to the winter festival the crashes were significantly more numerous. This was accompanied by stuttering and sound and music issues.
Anecdotal observation. one attempt to get through a day saw me actually leave the beach area and go where the festival wasn't being celebrated and I actually experienced the game stabilizing. The stuttering and sound issues stopped and it played well. I guess the cause and effect relationship of how many things were happening on screen and instability might be obvious, but I'm trying to be detailed.