Why do my online games connection just quit all the time?

if it is happening to all of them, then there is something wrong on your end. The ISP is providing you with good internet, but your modem or router may be bad. your computers ethernet/wifi card may be bad. or (which i doubt is the case since u were able to connect for a little while) your firewall may be disconnecting you from the server since th server asks to retrieve data from your system (which is what hackers and viruses do, so your firewall may engage)