Frozen milk gone sour?

SMac2013

So I have a freezer full of extra milk from when I was overflowing in the early days. I took one of the milk bags out and thawed it for some cereal and it was sour! How is that possible? I really don't want to throw all of my supply out

Sarcasm101

How do you know its sour? Colostrum, or your first milk, tends to be yellow in color.

Does it smell funky? Have you had any freezer issues? Power loss?

SMac2013

I tasted it before I mixed it in the cereal... And threw up. Sour. Nothing else in our freezer is bad...

mcmang

Sounds like a lipase issue