Yellowing/curling leaves usually point to a watering problem. Either too little water and it's thirsty or it is not getting any water because the roots have rotted (due to overwatering). I am leaning towards root rot because the pot looks very large for the amount of cuttings/strands you have in the pot-- the soil will take longer to dry out because it is in a large container. You can unpot the scindapsus and check on its roots, if there is any salvageable roots you can cut off all the dead/rotted roots (brown and squishy) and repot it into a smaller container. If the roots are all dead you can propagate it in a glass of water (make sure to switch out the water every week or so) and move it back into soil once the roots grow a few inches. I hope this helps a bit!