I have been having constant issues since upgrading to G5 with the negotiation time before transmission. I have spent hours on the phone with Hughes Net tech support only to have them argue with me because I am not using the built in WiFi in the modem.
I am hard wired from modem to firewall. Wil my internal network established behind Firewall. The internal network is running great; capable of streaming movies as well as computer work at the same time.
I have rebooted everything and the problem persists.
The other thing I have notice since upgrade is my reported data use is 2.5 times more than on 4G doing the exact same thing
I don't know if this will make any difference, but you could try changing your DNS to Google's.