I was trying to get a WDS connection established and was having difficulties so I set the wds to dynamic. Now that was a big mistake I was suddenly spammed with wds connections all from a mac address with nothing but x’s and I immediately hit disable wlan 2 connection but it was already stuck in a loop of creating wds connections. It locked up the AP completely we had to go and physically reboot the system.
a good rule of thumb…
Put the device in Safemode when changing anything that might cause you to be abruptly disconnected.
To do this press CTRL+X in the terminal window. If you’re in winbox open the terminal and press CTRL+X leave the window open then make ur changes. When finished press CTRL+X again, in the terminal window, to release from safemode.
If you suddenly get disconnected the router will undo any settings you changed.
Thanks for that tip Wildbill
If you use dynamic WDS in a bridge, make sure you enable Spanning Tree Protocol (STP) under the bridge interface. What you saw was probably a bridge loop - it’ll kill everything 
Yeah I always have my STP enabled so it wasn’t that.