Originally Posted by Franzi
What makes them gush? I seem to have the same problem.
If the beers taste a little thinner, and perhaps with a hint of off-flavour (e.g., a stale plastic-like taste), you may have a gusher infection. These are pretty common and can be caused by a wild yeast or bacterial infection. The infection may only get worse with time, so the only thing to do is get all your bottles as cold as possible and drink them quickly (as per the good advice above).
If you know you added the correct amount of priming sugar, and the beer is not infected, then apparently the beer did not finish fermenting out fully before you bottled. This is less of an issue. It is a PITA, but you can carefully vent and re-seal all your bottles periodically until the pressure comes down.