Have you installed a new wireless network recently? What tplink model? If you log out from sleep mode, you have to manually switch on wifi? To verify whether it's the wifi in your house causing this,...

Did you change anything on your gaming console? reset the new router, set DMZ. contact tplink support to help you if problem persists.

don't know the exact date, but not now.

Are the two PCs are connected to the same router? Are you able to ping each other?

Hi, you should select Dynamic IP on the router, if no WAN IP address with Dynamic connection type, then try restart the modem only when the modem is connected to the router's Internet port.

What's your download speed? And what speed do you pay for from Xfinity? How did you test the speed?