Can you get to the modem's System Control Center at http://192.168.0.1/#!/usage? Are there any error messages? If you click the "I" (it's to the right of the word "English"), what's the system state code?
A state code of 0.0.0 means that everything on the HughesNet end is working as it should, and that there are no HughesNet equipment problems.
It's possible that it's just coincidence, and the lower speed is due to heavier system congestion, which often happens during the evenings and on the weekends.
With that said, you can run a few speed tests to demonstrate the speeds you are getting at current. This will help to show if there is a problem. To run the tests, please follow the instructions in the following post...
We're closing this thread since we haven't gotten a reply back from you all week. If you still have concerns, please start a new thread and include a detailed explanation so we can more effectively help you.