Seeing the radio interfaces reset if RLDP is enabled is expected. The AP needs to reset the radios because while RLDP is running the state of the radios has to be changed so that it can associate to other AP's. There are bugs filed to have the trap messages be clearer to why the radios reset.
I upgraded my controllers version to 7.x and I don’t receive these kind of messages at all, usually I used to receive these kind of messages 10 times daily but right now I don’t receive it. May be you can try upgrading the software version.