I have same issue. I'm using C#, and CoreTweet, and the my app is ASP.NET Web application hosted on Microsoft Azure Web Apps (old name is "Azure Websites").
I encounter this problem at every 8:00am morning in Japan.
It happen always 8:00am JST, every day.
I have no idea at this point, and I am not sure that this issue happened only on Azure.
Could you post comment here about what platform do you using when encounter this issue? > All