i usualy play with 40 ping,sometimes i get 300 ping but just for 5 minuets and sometimes 10

If you are having extended periods of lag like this, the likely culprit is downloads in the background or elsewhere on the network. You can check your Task Manager and sort by Network to see what application is using bandwidth on your computer (Steam, Windows updates, etc.). If it is someone else on the network using up the bandwidth you will have to work out a schedule or something so it's not an issue.