Device handler is not working between 2am to 9am

Hello!

I refresh my foobot device handler every 5 minutes for sending sensor data to my database.

I found that sensor data is not sent between 2 am to 9 am from 2017/06/14.

I read in the document my device handler is executed in the smartthings cloud or my hub.

Is it a problem from the cloud or my hub?

Thanks