Bonefish -
I would turn the CO2 tank off for a moment, while you release some of the excess pressure from the keg by pulling on the gas relief ring on the coupler. Then turn the CO2 back on at the correct PSI for your current liquid temp. It won't fix the problem immediately, since the beer has already absorbed the CO2, but it should hopefully balance out over time and get back closer to normal.
40percentrobot -
When you say, interior temp is 38, are you checking the liquid temp? Put a glass of water inside the kegerator and let it sit for 24 hours and then put your thermometer in the water.
To me, it sounds like you need to get back to the basics and make sure your liquid temp stays at 38 degrees and you apply the recommended PSI for that beer, I think it may be 14 PSIG. If you keep your beer colder, you need to drop the PSI one pound for every 2 degrees. If I'm trying to diagnose a problem, I check the temp once or twice a day at different times of the day (storage liquid temp & first pour temp).
One time I had a problem with a keg of Anchor Steam and it would spit foam at me on every pour... and I mean spit with force (it was a mess). I didn't have a lot of faith in the coupler, so I invested in a new/better one and that fixed the problem.
Good luck & don't give up.
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