Internet disconnects while on web

[Laur]

Hi, so i got another internet regarding to my last topic about the wifi which is not a problem anymore but....now i got "ethernet" which is connected by a cable anyway when i enter youtube or load a video on facebook or do something it just disconnects and i need to restart my pc, i tested it on another laptop and it works so i assume it is due my laptop, any suggestions ? ive heard i need to disable something in avg to make it works but i dont actually have avg, what can i do ?