I updated the firmware a few weeks back with the online update feature and my hardwired speeds have taken a massive dip.  With 2 seperate PC's and the much older (10 year old HP Omen) plugged into the ISP provided gateway, I'm pulling down 946Mbps....dang near max.  However, this drops to 641 Mbps at the AX6000 via the built-in speed test...and then drops even further, down to 541 Mbps by the time it reaches my PC.  I realize some loss is going to occur no matter what, but that's almost 400 Mbps.  

Is there a resolution for this issue, or a way for me to rollback to or reinstall the previous firmware version?