Unplug and then reseat all of the connections from the receiver to the servos a couple of times. That may fix the problem. If it does, you may have to do that again after a while-dirty/faulty connections. Happens to me on a couple of different planes from time to time. Turn on the xmitter and plane, then check aileron response before securing the wing to the fuselage each time you go the field to fly. Using two channels and mixing makes it a bit more complicated to trim the ailerons.