Device manager shows gateways as offline but it looks like they have internet connection..

I have some Gatways that randomly appear as Offline on Device Manager, but the devices at the endpoint seem to be online with the internet working. Right now I have one gateway this way. How can I do to diagnose what is going on?

Has invited:

Please download the log file of the device and email it with details of the issue to

I had the same problem can you let me know if it's ok now    

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