Can't hurt to check. It's a new lift, as things settle in, sometimes you realize you didn't quite torque something down enough.
I'll defer to someone else on the heim joint question. I don't have a great amount of experience with them.
I doubt it's a heim joint anyways. The Antirock uses heim joints and it crossed my mind that one of them could be bad. However, I don't know how that's possible with less than 1000 miles on the Antirock and very little off-roading.