I'm a new Gen5 user as of 12/13/17 and am experiencing the same evening data rate slowdown as is already well documented here.
EchoStar - 19 NAD
TestMy.net results: http://testmy.net/quickstats/dwhoule and report image below.
Based on the multitude of forum posts on this topic, it looks like this is a chronic HughesNet technical issue that is not being resolved, so I'll likely cancel my contract so as not to waste any more money here.
Good luck with that 'cancel' plan. In March of 2017 they stopped giving you 30 days to cancel and now you are stuck for the two year duration of the contract unless you want to pay $400 to get out. Please post a reply if you are able to cancel it as we just had Gen5 HughesNet installed yesterday, 12/14/17, and immediately disliked it. Our Verizon Jetpack is slower than molasses and sucks up data, but right away it was better than HughesNet.
So incredibly disappointed that HughesNet sales people LIED about how fast it would be and how many devices could be connected at one time with 'fast' results.
If you are not on beam 68, like the OP, or beam 55, it would benefit you to start a new topic to receive help with your speed issue. Look in the Satellite box on the following page to determine your beam... http://192.168.0.1/#!/home/information
BTW, the 30 day trial was done away with long before March 2017.
" it looks like this is a chronic HughesNet technical issue that is not being resolved, so I'll likely cancel my contract so as not to waste any more money here."
Actually, they are working on resolving the issue.