Frigidaire Gallery Fridge Leaks around water filter

The url shows the unit. (scroll down)
Changed the filter about two months ago, the large o-ring today.
Recently it started leaking. If you remove the cup and replace it, it seems to work fine (no leaks). Then after about two glasses full, when you depress the dispenser lever it makes a noise like a sudden breach in an air line and the water gushes out over the edges of the cup and continues leaking over the top of the filter cup. Obviously past the large o-ring but what could cause this sudden pressure and breech of the large o-ring?
Had the fridge for years with no problem other than the ice maker freezing up once. TIA for any help.
http://tinyurl.com/66ekzb
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