Draft tower pouring issue

[Jimmy]

I'm having an issue with one of my taps/keg. I've had the brown hooked up to it, and it's been working great up until the past week. The very beginning of the pour is great, then it turns to foam, and spits and sputters with air. If I shut it off then start to pour again, it follows the same process. Any suggestions?

Oh, and the keg is getting low but it pours fine from a picnic tap.

[NASH]

Gas is breaking out in your line so it's either got a warm spot in it or the beer is overcarbonated. Since it used to be fine I suspect it's gaining carbonation over time