My friend changed his ISP, thinking his internet will be better. He went from a 4 mbps download speed plan to a 20 mbps download speed plan. The problem is the speed goes from 1 mbps to 20 and jumps. In gaming, we can see his ping jump from around 60 to a random 500 and it causes him to lag. He had this problem forever, even with the new ISP. I believed it was a virus, there was viruses, we cleared it out, his pc is healthy, but the internet is still jumpy. What possible reason is there. The connection type is wifi. When he got a new ISP, the router changed too.