No because I've had two snowmen in my town over 2 days exceot the one I build the first day was smaller. Both snowmen were perfect snowmen, maybe the reason why it was different for you was because yours werent perfect.
Are you making your snowmen too close to trees? I made one too close to a tree once, and it disappeared.
& yeah, you find Dung Beetles pushing snowballs. I caught my first today, they're hard to catch, I kept scaring them away or hitting the snowball instead XD I dunno if this'll help, but I rolled the snowball a bit and kept checking back every 5 mins or so (er I entered a building too cause I wasn't sure if it would come =/). Also they don't go to your snowmen, only the snowballs by themselves.
You'll find them pushing the snowballs. That is why if you want to make a perfect snowman, you had better keep an eye on those snowballs. The dung beetles just love to push the snowballs into the river!
Da da da daaaaa!
You got a cookie! Mmmm...