Hey! Having some trouble with beer I keep longer than a couple of weeks. Some of them make small volcano's seconds after opening them. I don't think it is an infection thing because the beer is clear before opening and doesn't taste off. When I look close it looks like the CO2 bubbles are picking up the thin yeast leayer which results in more bubbles and boom volcano... then the beer is quite muddy because of the yeast. I prime with 7g/l table sugar. Any suggestions?