Because mine is really getting on my nerves (nearly wrote 'tits' )
First 6 months of using it was fine. But last few periods have been quite heavy for first day or 2 and I'm having real difficulty inserting it properly. Don't seem to be able to get in right position to get it up comfortably and that's why I think it leaks a bit. I couldn't risk leaks at work so I've used tampons for last 2 periods and feel much 'safer' but I used to feel safe with my mooncup and just can't feel like that now. I have tilted womb (like lots of people) - might this be a factor? I've just ended up getting really cross trying to get in properly so haven't bothered.
Any words of advice?