Answer: It is quite possible that it is overwatered. This is easy to do, especially if the new pot is substantially larger than the original pot or if the plant needed repotting so badly that you used to have to water it very often. It is also possible that the new soil is much more water retentive or less well aerated than the old soil which would also mean relatively less water is needed. (Some of the new potting soil mixes include a special water holding polymer to reduce watering needs -- if you still have the bag, take a look and see if you used one of these.)
A clay pot allows moisture to evaporate through it, so if you are a habitual over-waterer you might be better off using clay pots in general, but pothos will also grow fine in a plastic pot. Pothos is basically a low maintenance plant and does best if watered quite well (drenched), and then allowed to dry out somewhat before watering again. Back off on the watering and see if that helps. Also, be careful you are not overfertilizing.
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