Plant Problem

Plant Problem

Hey all, new member here. I've been having a problem with a plant I got two weeks ago. It's a kind of lily plant, though I don't have the exact name (it's similar to a Peace Lily I think). I had it for a week at home, and it seemed to be doing alright, but it's been in my dorm room a week, and some of the leaves have been turning black. It's lost almost 10 big leaves already, and more are changing color. I think it's getting adequate sun and water, and the other plants in my room are doing fine, so I can't figure out what's wrong with it. If someone has some ideas as to what to do I'd appreciate it. I'm starting to get worried :(
Grandmother’s Iris

Grandmother’s Iris

The beginnings of my garden

The beginnings of my garden

This is the lushest my front bed has ever been in May.

This is the lushest my front bed has ever been in May.

Finally, some warmer weather in central FL!

Finally, some warmer weather in central FL!

Passiflora leaf ID

Passiflora leaf ID

The first day of summer in the garden of good and evil

The first day of summer in the garden of good and evil