bug for lol client 7.3.17_02_02_11_37

Sometimes when i was trying to start a game , the game will suddenly no responding and i have to restart the game or i cant pick a champion . but if i restart the client , i need wait for 5 extra mins to start again . My PC . DELL XPS 15 9530 . windows 10 home . Version 1511 . processor inter core i7-4712HQ Cpu 2.30GHz Installed RAM 16.0 GB system type 64-bit operating system