Internet connection failure on NanoStation loco M2?

Question

Computer networks

There are two Ubiquiti NanoStation loco M2 connected to each other using a wireless bridge within 20 meters of line of sight.
After setting up for half a year, the Internet was successfully and without interruptions supplied to the department and supplied 10 workstations.
Last month, there were failures in the supply of the Internet connection, it drops from 5 to 40 minutes, then it works, again not for a long time, and so constantly, it still does not ping, and if it pings, then with a loss of 75%. (In general, there is no Internet)
(Fortunately, there is a backup gateway in the network)
Visually, at the station itself, the signal scale has not changed in any way.
In general, I have little experience in network settings and diagnostics, but I want to solve the problem (T.K., interesting), and the employees complain.
Please tell me in which direction to look and how to solve this problem?

Answer 1

The nanostation itself has the functionality of ether diagnostics. Watched? Is everything ok there?

Answer 2

First, you need to diagnose a wired connection to the points themselves (constant ping to each point from its "segment" of the network, what happens when the connection collapses?). The points, as I understand it, are on the street, check the "outer" ends of the patch cords and the rj-45 ports at the points for moisture, etc.