Thank you for your support, Carl! Also thanks for the side recommendation. I did as recommended :)

Apparently disabling IPv6 did the job. How? Why?

@ArcherC8 Hey, Thanks for the article but I did try all of the things mentioned there Not sure about the HDCP problem. My TV is not connected to anything besides my PC through HDMI. But even without...

@Carl Hey Carl! Thanks for the tip but unfortunetly it did not work :( Ive attached a photo with the settings i have done, according to your instructions. Maybe there is something different/wrong...

@Carl Gotta agree with you. ISP support center people really dont know sh*t, techincally. I have also contacted LG Customer Care and they told me to check with the ISP and/or check the routers...

@ArcherC8 Thanks for the reply, I will try the IPv6 testing and come back with a reply ASAP.