Ethernet connection is spiking, disconnecting and reconnecting

Hi everyone.

I have a problem with my internet connection. First, I've tried a PCI Wi-Fi card and a repeater and nothing change.

My computer have a problem with the internet connection. When I play games like Counter-Strike, I'm spiking and I have some rollback every 5s. Here's a picture of my internet connection in the task manager:

As you can see, I'm spiking alot. Sometimes, my PC disconnect from the router (even when it's wired).

What I tried:
- Recovery
- Flush DNS
- Renew IP
- Uninstall/Install network drivers and adapter
- Uninstall/Install general drivers

And... nothing worked, except one thing:
Fix network connection issues - Windows Help

• Type netsh winsock reset and press Enter.
  
• Type netsh int ip reset and press Enter.
  
• Type ipconfig /release and press Enter.
  
• Type ipconfig /renew and press Enter.
  
• Type ipconfig /flushdns and press Enter.

It's working for like 30 minutes and then I'm spiking and lagging again. I suppose it's a DNS/IP problem. I need to do it again every time I want to play 30 minutes. Anyone have a idea?

Thanks!

PS: When I'm browsing on chrome, I don't see the spike effects, only when I play or skype.

Try, changing your DNS router to 8.8.8.8 and 8.8.4.4. These are the public google DNS routers. I had gaming issues and changing to these DNS fixed my problem, Internet problems with my ISP.