30Mbps internet, but ping is 300 one game, and normal the next

As the title suggests, this started happening right after the patch 9.2, when Arurf was release. I have tried everything, including firewalls, changing DNS, using the hextech repair app. Nothing works. In other games however ping is perfectly stable without any lag when I connect to EU servers in other online games. Is it some sort of server problem? Since nothing I try works, its been affecting all my friends from this region. We play from South Asia.
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