All of the sudden in the past 5 days my smartthings hub has been alarming me 2-5 times a day of my hub going on and offline. I read the forum and saw this happen before and mine is about the same. The hub is still accessible from my phone as are the devices. I have not been home when the hub has done this but this all started this week. The hub has been running great for 2 months before this. I have tried a new power outlet, network port on the router, and network wire. I am lost. PLEASE HELP 
Is the rest of your home network down when this happens? It could be router, switch, carrier, etc.
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Check your hub event logs from your IDE to see if it actually went offline/rebooted. If not it’s likely your internet connection.
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And if all of the above don’t help, call the Samsung SmartThings support number directly. They are good people who will work with you.
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Turns out Thursday afternoon my internet crashed and was dead for 18 hours before they got me back up and running. It turned out to be an internet issue not a hub issue.
Thanks!
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