RTT Errors

This issue started about 10 days ago, and continues to get worse as time progresses.  I did reboot the modem this past Tuesday, which temporarily got rid of all of the red Xs on the RTT line of the diagnostics page and allowed us good access to the internet for a day or two. But when I rebooted again this afternoon, I saw no real improvement.

There have been no state codes indicated - just RTT errors on the diagnostics page, which apparently doesn't produce a state code but does totally disrupt performance.  I have been using Hughes satellite internet since DirecPC days, and this is an issue I have not seen before.  I also understand latency quite well after that long time as a user.  The current issue is way beyond latency, as indicated by the measured 6-sec ping time in my initial post.  My Eero WiFi router won't stay connected, and the WiFi built into the Hughes router is only marginally better.  Most attempts to open a web page result in time-out failures.  Use of a LAN connection is marginally more successful than WiFi, but not anywhere near normal.

Following are screen shots of relevant pages from this afternoon.  These are consistent with what I have been experiencing for the past 10 days.