It happened out of nowhere. I use this pc and wireless for 6 months and it working normal, then 2 days ago the ping suddenly high and its has some pattern. (30,30,30,30,2500,30,30,30,30,2500,...) I restarted wifi router -it didnt help. I try to check on others pc with the same wifi- it didnt have this problem. so i guess it is on the computer i use but i dont know where i should fix. Can someone help? (sorry for my english ._.)
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