Breast milk not freezing

[Lazybones80]

Help! I have been expressing and freezing for the last 2 months with no problems. However, for the last week my milk just isn't freezing. Everything else in the freezer is frozen, including ice-cubes that were put in after the milk. The older milk remains frozen solid, so I don't think it's the freezer's fault. I've tried changing freezer bags and am currently using some rather pricey medela ones, but still the milk remains liquid.
I haven't been drinking alcohol. I have been eating lactation cookies with brewer's yeast- not sure if this makes any difference.
I'm desperate! I work, so I need to express and store milk or I'll have to give up feeding. DS is only 4 months old, so I'd love to keep feeding for at least another 2 months.

I have no idea why it isn't freezing solid, but if it's cold then isn't that all that matters? It must be at the same temp as the freezer even if it isn't solid.

Also, you can store bm in the fridge for a good few days too - would that be an option? LLL have some guidance about this.

Thanks Culture. Maybe I'll aim to use the milk within 8 days despite keeping it in the freezer just in case. This should give me enough time to pump enough for work