Lucerne 1% milk in 4 litre jug

Lucerne milk is normally good, however in the last couple of months I've been having issues with the milk spoiling before the expiry date. The milk also doesn't have a consistent taste from jug to jug. Last week I had to throw out milk again because it has a weird chemical taste to it. I phoned the company and they will be doing a quality control investigation. Other than those issues the milk is great!