mturk suddenly giving me low paying HITs?

from 9/17 to 9/23 i made $31.54. i was getting pretty decent paying HITs (some were like $3-$4) and now the past couple days i've made a total of $0.86. all the HITs im being shown are like 2 cents each. ive done a ton of tests and qualifications so i dont understand why i went from doing pretty well to barely getting anything. any tips?