Nighthawk X6 R8000 slow after Firmware update to 1.0.4.46

Long story short, Firmware version 1.0.4.46 reduced throughput on my Netgear Router by half! Rolling back to 1.0.4.28_10.1.54 resolved the issue.

Long story.  I was experiencing slow internet connectivity on WiFi and cabled systems throughout my home network. I have a 600MBps connection with Xfinity. Wired devices were seeing less than 250MBps. One odd thing I noticed was while the speedtest was running, it was gradually showing slower and slower speeds. Test results went form 300MBps down to 34 MBps at times. Wonky, right?

My setup DOCSIS 3.1 Cable Modem >>> Nighthawk R8000 - Devices connected directly to the R8000 and a Linksys 8 port switch. All speedtests were coming in at less than haf of my allotted bandwidth. I started checking cables, and settings on the router, rebooted everything, etc.. Nothing was fixing it. Called Xfinity and they tested and reset the modem remotely and still no change. I realized my Pc that I was troubleshooting from was traversing the router. I disconnected everything and connected my PC directly to the cable modem and I was seeing the 600MBps throughput consistently. I tested the cabling and it was good. My router is in a different room than the Cable modem so I moved it to the cable modem and connected with brand new cables.Cable Modem >>> Router >>> PC. Still seeing slow speeds. I reset the Router, and still slow. I tried everything I could think of and then remembered the Router recently update the firmware to the latest version. I rolled back the Firmware code, reconfigured the Router settings, and my issues was immediately resolved. Moved the router back to its original location and connectivity config and it was still hitting 600MBps. I'm not sure what is going on but the new firmware had the NetGear Armor options. Could have been interferring. I have set autoupdates to OFF now to prevent these issues from being introduced.