EX6120 Device LED doesnt light up when pc is connected but PC is connected somewhat

My EX6120 has been working fine for around a year until now. The extender is connected to my router fine and I can connect to the extender with my phone. The device LED only lights up when my phone is connected and not when my pc is connected to it alone via ethernet cable. I have updated the firmware

• Firmware Version: V1.0.0.54_1.0.34

I have tried resetting and rebooting and to set up the extender up again but I've had no success. On the pc the internet actually works even though the Device LED is not light up but not everything works weirdly. I can watch a youtube video or look at Twitter but when I launch a game or visit a random site it will just stop trying to connect and say "No Internet". Any help would be amazing

Thanks