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The usual culprits for this are either a stressed fermentation (but you can taste that), or some kind of contaminant on your equipment or glasses.


If it’s hit and miss it might be the former. If it’s consistent then I’d think about anywhere some grease or other contaminants might be getting into your beer.


When I was early on in my brewing I had the soft drink head for every beer. I tracked it down to me using a kitchen pan for making my priming sugar solution. It was leaving a trace amount of grease in the beer, which was killing the head. I bought a cheap stainless pan for brewing duties and the problem went away.


I’ve also found that glasses that have come out of the dishwasher within a few hours will do the same. I assume it’s the rinse aid left on the glasses that takes time to break down. A quick rinse of the glass fixes this.


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