config radio mikrotik via mac address Problem

To configure MikroTik radio sxt sqlite5 in Winbox, when I log in via MAC address, it disconnects after a few seconds. But when I log in via IP address, I don’t have this problem. What could be the cause?
I have both updated and factory reset but I still have the same problem.

Probably it is something in configuration blocking mac-winbox.
Follow this:
http://forum.mikrotik.com/t/forum-rules/173010/1
and post your configuration.