I bought a 1-gallon keg to bring beer to dinners, etc. it seems to carbonate when it comes out of the keg. Almost too much foam. When I purge gas comes out. Even though the foam has stayed a bit the beer tastes basically entirely flat. It’s had weeks under pressure. Could it be the beer? Something I’m doing? I’ve heard these get metal shards under the gasket and I haven’t had a chance to check. But would that cause the beer to go so flat? The glass was also apx 10-12 F warmer than the beer so not a huge difference. I’m also guessing that the warmer glass will only eliminate some CO2 not all of it. I’m knew to kegging so I’m having a hard time trouble shooting this. My 2.5 gal keg does just fine. If it matters it’s an all-grain ancho witbier.