Hi @EngAdel 

So, eventually, after a small talk with MR.S, have you upgraded your firmware to the latest one?

If you expect this to be fixed quickly, provide some helpful information to save your time. Or I have to ask things from you. That'll take time if you are okay with that. I don't reply to DM if you have an issue, @ me in your thread.

In one of the pictures you provided, you have 4 times hit 100% CPU usage, what did you do to test the Internet? By what kind of way to verify that the Internet has stopped? I expect to see the methodology for your test.

What happened to the router when it hit 4 times 100%? Is any high-bandwidth traffic going on when you were monitoring the CPU usage? Physically, any cables plugged out?

What do you want to express in this picture? All links are down and CPU usage is increasing?

Why all of them are getting private IP addresses? And it looks like the WANs are designated to different network segments. Is there a router with VLAN interface capability placed as the uplink? And all of your WANs connected to the same router?

What's your network diagram?

Is there a loop? I think your network probably has a loop. At least it gives me the feeling of it.

If you lack the ability to troubleshoot, and expect a quick and effective reply, better provide enough details so I or other people on the forum can support or help.

Your DM does not help at all and there isn't anything helpful in this thread.