A check valve like that is not a bad idea. I have one that I use when kegging homebrew.
It sounds like you just need a new coupler. After a while, the seals and gaskets wear out.
I had a similar problem with my G coupler that I use for Anchor Steam. I didn't have beer in the gas line, but I did have a big burst of gas on each pour. A new coupler seemed to fix things.
Good luck.
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