Recently, my Internet has been suffering from this problem and I can't watch any videos even in 480p -sometimes 360p-. I discovered this when I went into router interface. I opened the log page and saw that I've been getting DoS ICMP flood attacks. So, I cleaned my computer from viruses with Malwarebytes and HitmanPro -that was suggested to me at another forum-. I'm getting tons of attacks and we have a FUP (Fair Usage Policy) -a bandwith cap- in our country and these attacks literally eats my bandwith. What shall I do? Thanks for the help already and sorry for my English if I made any mistakes.