Strange thing. On Monday I kegged my beer and forced carbed at 30 psi for 48 hours, then down to 10psi until today. This morning I purged the keg a bit and tried it. nice flavor and carb bubbles ever present. Well, This afternoon, I noticed i was getting nearly all foam, so I burped the keg quite a few times. Now, I'm still getting loads of foam BUT no more carb bubbles! I can actually taste the difference!! PLEASE HELP!!!!!