To me it looks like too much water. But if you transplanted it, it could be a combination of the 2. It could be heat related as well, however, usually when mine wilt when the temps get over 95 or so, the leaves dont tend to curl like that. But they look almost identical to when I get hit with a TStorm out of the blue after a heavy watering. I use a cheapo moisture monitor from a local DIY store to tell if the soil is really wet (since I don't have 12" fingers), and that seems to give me a idiots guide to watering! Good Luck.
Matt