It sounds like transplant shock. Especially if you took some roots back. Be careful on watering. It won't need regular watering until you see it growing again. You want it in a west or south facing window. North windows are crappy :P best of luck!

Photos would help.

I would leave the leaves to allow the plant to recycle those resources and only remove them when they dry up enough that they easily pull away from the plant without effort.

I do not believe it to be sunburn but a picture could change my mind.

A northern exposure window doesn't get much light at all and maybe the plant would even be happy closer to the window. They use light to manufacture energy.

Thank you everyone!

I believe you're right that it is/was in transplant shock. I will attach a couple photos. I am definitely holding back water but I do see growth.

Let me guess, did you leave the original rootball on the plant, so now it's got the old soil & the new soil? That would make for drainage problems, different soils would take up water at different rates, hence the yellowing leaves. New growth is a hopeful sign, I'd watch it closely.

If the yellowing increases, I'd unpot it, remove all the soil completely & change it all.

PS: I'd doubt too much light is the issue, only would be if put in direct sun, would burn.

I agree with the thoughts about root/nutrition/transplant shock troubles. I've had a lot of experience with peace lilies getting too much light. (You'd think 12 ft away from a SE window would be fine, but you'd be wrong. I ended up putting it in the dark corner next to the window and it's full, bushy, and happy.) The leaves turn bright yellow very quickly when there's too much ambient light. I suspect yours has unhappy roots. What kind of potting mix did you move it into? I've never heard of spaths being at risk of overwatering. Actually, people grow them entirely in water, as they're that happy having their feet wet. Maybe that could be part of the problem.

Karen,

I cut off see of the roots at the bottom and made slits on the outside of the root ball which is what I do when I transplant all my plants.

Sage,

The plant is definitely not getting worse and the their is new growth. This may sound weird but I transplanted it into semi-course orchid mix. I'm prone to overwatering indoor plants so I believe this mix will help with that rather than having another kind of mix.

Z

this is a water-loving plant that often grows naturally by the streams with its roots in water. semi-coarse mix won't give it a chance to absorb enough - water will just pour through leaving it thirsty.

it'll be wilting on you constantly.

It the semi-course mix actually holds a bit of water. I will watch it for the next couple months. If it can't handle the mix, I will transplant it again. For right now it seems to be getting over the transplant shock and putting out some new growth.

Z