maybe you can reset the router or change the 2.4G channel to try

I have same SSID. If you are't sure, you can test same ssid for weeks and test different ssid for weeks. I guess you will figure out what you really want:D

Normally you will see all the lights turning on for a sec then turning off then power starts blinking. Wonder if you tried pushing the reset hole for not. Maybe you can hold it for 10~15 seconds to...

how about other devices like your phones or laptops? Did you set up fixed IP but different segment on your PC?

It's more like some settings on Asus router. Maybe you need to change IP address on that router or turn off DHCP on that router. There's no such settings on TP-LINK as I know.

As you said, your PC has a permanent address 192.168.3.3 so it won't show on DHCP list. I am thinking maybe it's DNS issue or MTU size? Still don't know why it can be fixed by rebooting. You can...