@alejandro12, you will probably want to start your own topic about your issue, but my questions for trying to help will pretty much be the same.
Is the link actually going down (as in not passing traffic?)
If so, have you checked the power supplies? Logs? Cables?
If the Link is not actually going down just the connection to Mimosa Cloud: What have you checked in your network? Do you have a firewall? Have you checked the link when the cloud connection is down and seen if you can ping out to the internet?
As I said in my first post though: Always check Layer 1 (Physical) first. (From the OSI 7 Layer Model, normally a good idea to work your way up each layer when checking to see if there is an issue.)