Downgrade RouterOS to 6.45.9 (long-term). We have a lot of issues with 6.47 and up on all 60GHz MikroTik devices.
Ref #1: https://forum.mikrotik.com/viewtopic.php?f=7&t=133374&start=300#p812033
Ref #2: http://forum.mikrotik.com/t/v6-47-stable-is-released/140100/1