i'm having divacup issues

i've been using the divacup for about 5 years. up until a few months ago, i've not had any issues, but now i'm having leaking problems. i don't know if the cup isn't opening up properly or what, but i'm having to wear a pad as backup. it's not overflowing, because when i go to empty it, it's less than half full.

i'm 26, and have never been pregnant, so i'm using the size 1. even though i've not had a baby, and am under 30, do you think i still need to go up to the size 2? or do i just need to get a new cup?