Could this be from the brumby tap, if you use one? I read on ikegger that they recommend cleaning their brumby taps every week to avoid a flavour impact.Mardoo said:There's zero flavour degradation when the beer is left in the original corny keg, gassed from my main 6kg cylinder. The flavour doesn't come on until a week or so after the beer has been transferred to the mini keg.