also, what kind of soil is it in? did you just pick up whatever from the store? do you know what's in it? it looks like it's lacking perlite, which is necessary for correct drainage. otherwise the soil holds too much water and it drowns the plant. pot hates being overwatered, if anything underwatering it is beter. think about it - where it grows naturally outdoors (which is pretty much anywhere except desert, rainforest, & tundra) - mother nature never lets the conditions go crazy. if it does (ie: a flood - which is probably what your plant is thinking is happening), the plant dies.

when growing indoors YOU have to be in total control. YOU have to play the role of mother nature, not the easiest thing to do sometimes.

anyway i'm digressing - i bet that is probably your problem. it's kinda too late now unfortunately though, you really can't mix up the soil with the plant already growing in it. try watering it less. also don't pour the water directly on the soil, put a papertowel down first so it doesn't wash away any soil and to help it spread evenly.