I have a peace Lilly that I just can't get going. When I first got it, it had a nice flower and it withered. I transplanted it into a bigger pot hoping that would help but it still isn't doing too well. I water it once a week and it gets plenty of sun where it sits so I don't have to move it. Any suggestions

No suggestions from me . Every one I've ever tried to grow has done exactly what you describe and never improved. You might have better luck with your question if you post it in the houseplants forum. Many of the folks in that forum grow a huge array of container grown plants. Loads of experience there with all kinds of plants.

to NGA @Mark615

Peacelily is a low light plant i.e. don't sit it in full sun on the windowsill. I water mine only when it wilts and it sits in my dining room but not near bright sun . Mine is also in the same soil it has been in for 5 years .....every year or so I divide it and give some away .......I repot in the same soil , this allows the plant roots a little more space . Hope this helps in some small way Here is a link that might help. http://homeguides.sfgate.com/c...

I have kept a few different peace lilies for years.
The red pot is a type I'm very cautious about. I find plants just don't like them. With typically only one center hole, they clog easily. And they just don't breathe at all.
If, my plant, I would take it out and plant in a smaller cheap nursery pot (plenty of holes) in fresh potting mix. As said, it doesn't need a lot of bright light. Depending on your location, 'plenty of sun' on an indoor windowsill may be just fine. Most of all, it needs your patience to let it be, not overwater (might not neeed it once a week). And just observe.

This is a 2016 thread bumped by someone who wants to have you click a link, which I am removing.

Good ketch Miss Sue....