What hub model do you have? If you'd like, you can send me a private message along with your hub's MAC or id and I'd be glad to check to see if you are dealing with a hardware issue. Automation stopping is indicative of an issue larger than a network connectivity problem, Jumbo frames as others mentioned above would cause that, but you said you turned jumbo frames off. Are you using PoE to power the hub instead of the power supply that came with the hub?
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