SMC Valves... 3/8 VS 1/2... sticking

I use 1/2" SMCs on my truck and havent had one stick yet.. Are you meaning stick randomly, or during the winter? I'm considering putting a little bit of air brake anti-freeze in my air tank this winter, its safe for valves.. so anytime I hit my switches itll run a mist through them hopefully, and protect a little overnight.

my r/f likes to stick randomly lol