Game freezes within 15 minute after the patch

The game freezes usually in the first 8-15 min for 30 seconds then it reconnects(sometimes successfully, sometimes just stays the same and requires reconnect). It is the only LoL freezing. I had music on while freezing, it kept playing without any interruption while LoL was freezing. I can alt tab while freeze and other stuff works normally. I also checked my PC temperatures it is max 70C (laptop). I clean installed LoL and my graphics driver. It didnt solve the issue. I didnt have anything like this before the patch. Any suggestions?
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