You are not first one that report issues with happiness AC. Looks like happy AC is faulty series.
http://forum.mikrotik.com/t/hap-ac-faulty-seriers-very-poor-lan-performance-switch-problem/96655/1
http://forum.mikrotik.com/t/hap-ac-slow-ethernet-internet-performance/96275/1
Stay away from happening AC until engineering don’t resolvev this issue.