I would like to give you guys a heads up and ask for advice, because it seems there is a faulty series of HAP AC with somehow corrupted switch causing terrible performance on ethernet ports - I still hope its some kind of software issue (or maybe wrong config) but support is not responding to our emails, so we are kept in the dark here…
More information can be found here: http://forum.mikrotik.com/t/hap-ac-faulty-seriers-very-poor-lan-performance-switch-problem/96655/1 If anybody knows what can cause this I would love to hear about it.