I am happy to report my WiFi issue is fixed. Unfortunately I can't explain why. While in the process of trying to resolve my issue, with the help here and TP-Link support, my computer developed...

@pcuttle OK here is the situation now. Even thought I was using the cable that came with the new modem to connect the modem to the router it evidently was defective. However when I replaced it I...

@Riley_S Thank for the suggestion, BTW it was the same as support. Unfortunately, it made no difference. Thanks RodmanB

I also did a factory reset to no resolve.

@IrvSp Tryed this and lost connection. Had to change back to "auto-negotiate"

@pcuttle Hardwired and switched from one to the other. "Check to see what speed your computer is negotiating with router when connected to it via Ethernet" Not sure how to do this, please advise.on...