It's uncommon for sunburn to cause a total collapse of a plant, so the issue is likely to be found in watering habits. I'd say the odds significantly favor the issue being related to the effects of over-watering. If the issue is indeed related to over-watering, as I suspect, whether the plant makes it or not depends on how severely the roots are damaged. The best course is to depot the plant, inspect the roots for rot, trim any roots visibly compromised or suspected of infection by rot, and repot into an appropriate size container with an appropriate soil.

The alternate, which offers a reduced expectation of an end result that's favorable, would be to depot the plant if the soil is wet (as opposed to damp), and place the root mass on a stack of newspaper, paper bags, an old towel .... to dry down before returning it to its container, after which you would monitor water needs more carefully.

I should have asked if you fertilized the plant since acquiring it. If yes, it could be the reason or play a part in the problem. If you did fertilize, please describe what you used and at what strength.

Al