Abnormal stool: yellow mucus and irregular bowel movement

I'm passing clear sometimes yellow mucus instead of stool sometimes and it is usually acompanied with alot of gas that sometimes burns when released. It usually clears up the next day but it comes back very often. I do have normal bowel movements, with no signs of black or bloody stool. I have no abdominal pain. I get alittle constipated once in a while. I have normal bowel movements about once or twice a day but once in a while I have a really big bowel movement in a single day(Not Diarrhea). Then I resume the normal bowel movements for a week or two before having a big movement again. Why do I have recurring gas and mucus and why the big bowel movement about once every or every other week ?