If you are taking a break for say a quarter of an hour (not any longer) you can leave your airbrush connected to the hose hanging on an airbrush holder. Never leave your airbrush lying on your work table while it is attatched to the air hose as it can fall off onto the ground and damage the fine parts.
The Paint is Splattering:
There are a couple of ways to unblock it. firstly check if tiny hole in fluid container cap is unblocked. Try cleaning the air cap this usually gets a build up of paint quite often especially when using temporary tattoo paints. After unscrewing the aircap with a clean cloth gently clean the tip of the needle you can usually see paint build up here also.
After carrying out these two steps test to see if the problem has been rectified. If still splattering apply high air pressure facing onto a rag ( by pushing down and all the way back at the same time) If problem persists check paint viscosity. The paint you are using may need thinning, if using Airbrush Temporary tattoo paint thin with a little Isopropyl Alcohol.
If you are still having problems you may need to do a complete pull down and proper clean of the airbrush
Or you may have a destruction in the air hose ( sometimes I have found that I am merely squashing the air hose with the leg of the chair I am sitting on.)