I have an LT-40 ARF and I had two separate aileron issues.

The first was that I didn't seal the gap between the aileron and the wing with tape.

The second (unrelated) was that one of the torque rods had dug into the inside of the aileron and created a lot of play. I think I didn't use enough epoxy when I connected them. This almost cause a crash as I could only turn to the left. If your ailerons wiggle then you may have this problem.