Lost wan connection

Hello,
I am having these problems with my XG:
I receive notifications that the Change in Gateway Status is down and after 5-10 seconds it comes back up.
When this happens to us we lose the Internet connection in the network and then it comes back.
It does not have constant drops, it happens when there are users and when there are not.

No changes have been made to the configuration and before the system worked correctly.
In the Log Viewer that has the web of the firewall I do not see anything strange or I do not know how to see what is causing the problem.

They can help me find the problem and be able to solve it. If you need any more information, tell me and I will provide it.

Thank you.