This question cannot be answered with just AP type. Firmware version, deployment type (Instant/controller/tunneled/remote/bridged), authentication type, role configuration, Application filtering all can be relevant. What you describe, only reverse DNS, doesn't ring a bell makes sense for a straight-forward configuration. What you can do is a 'blind' firmware upgrade to the latest version and see if that helps, or disable all features that you don't need and go back to the bare minimum to see if that works.
Please reach out to your Aruba partner or Aruba TAC support as they may ask the right questions to find out what may be configured wrong.