It's probably more of a phsycological thing than anything else. Now that it has happened a couple of times, you anticipate it and its the embarressment of going red that makes you go red in the first place. You just need to keep telling yourself that your being stupid and that there is nothing to be embarressed about and that your not going to go red. I know this sounds simple and stupid but i have had similar issues with other things (not going red, but the phsycology aspect) and once you start to tell yourself this, it really helps.