3 second link drop problem

RouterOS Wireless Networking
1

Hi to all
I have 3 link net box 5 with 32db kenbotong dish
bandwidth test is good enough for our work but link drop 3 second and then go up in bandwidth test.
here is image:

any one can help or say what means this?
thank you

2

Go take a look in the logs. it should show why the link is dropping.

Usually its something like extensive data loss or not polled for too long

3

thank you but no message appear in log when link drops.
any suggest?

4

Are you using a bridge port with RSTP enabled. This can cause some issues.