mikrotik sxt 5hnd bridge stops working

I have two mikrotik sxt 5hnd 1.6 miles apart setup in bridge per this example http://www.youtube.com/watch?v=XXn97SFH9SM.
I have the AP set to receive it’s IP using DHCP from a DSL router. The CPE also mikrotik sxt 5hnd it’s from the DSL router.
Problem is, this worked great for about two weeks. Now it doesn’t. Then yesterday it worked. Now it doesn’t. Signal has not changes and link is up. I don’t know how to check to see what the problem is.

If the connection betwine two SXT is fine than u dont have problem with the link

It’s working again. I did change the AP to static IP and changed port on the router. Now Wait and see how long it keeps working.