@Prof mine seems to be working fine now after rebooting a couple of times. Speed test now runs again and speed is back to normal range. FYI mine is an Archer C4000 so my latest firmware is different...

@Prof I should add to my prior post that the internet speed is dramatically slower especially on upload. We were getting 460 downloand and 450 upload wired and in the 300's for each wireless. Now my...

@Prof I am getting this same Failed to test the speed message and have been getting it for the last couple of days. And our service is definitely slower!