Take it out of the sun. Also before you water check and see if the soil is dry all the way down into the pot. Your leaves look more like they're drowning than drying out. Either way, out of the sun for a few hours and then limit it to five or six hours of sun a day.
Could be it just didn't harden off as well, I have 1 habanero that as soon as I put it outside in the sun it immediately drops(all his buddies the same size are fine), I haven't had a lot of sun as its been cold and rainy the past few days... and I mean real cold 3C nighttime temperatures but my plants are in containers and come in every evening, the last few days they were inside in the day as well as 7C was our daytime high.