It's difficult to know without seeing a picture. Could you post one? Syngonium
, as a rule, aren't subject to a lot of pests, but are sometimes infested with spider mites or mealy bugs.
Arrowhead vine, the common name for Syngonium podophyllum
, isn't a particularly demanding plant. It is a vine, and as it matures, needs some support. They like bright light, but will do well in low light situations, as well. Some varieties seem able to do well with less light than others, but none of them likes direct sun.
They need high humidity, so you can either mist the plant several times a day, or place it on a humidity tray. (Another option is to place the plant in the bathroom, where it can enjoy the humidity while family members shower.)
They require a pot with good drainage, and any good potting mix should work fine. Water when the surface of the soil is dry down to about a half-inch deep. In the winter, they prefer to be even a bit drier. Don't allow the pot to stand in water. These plant tend to be subject to root rot, so it's very important not to overwater them. If you repotted into too large a pot, the excess soil around the roots could cause the roots to stay too wet, leading to root rot. Root rot produces all the same symptoms as underwatering, I.e. droopiness, wilting, drying tips on the leaves, etc., because there aren't enough healthy roots to absorb sufficient moisture to support the top growth.
They like to be fed regularly. I use a liquid plant food, mixed to half-strength or weaker, and feed every time I water.
They are tropical plants and don't like temperatures under about 60Ã‚Âº F, but they sometimes wilt a bit in very warm temperatures.
That's about all I can think of to suggest. A picture really would be helpful.