lol client cause dc of wifi

it happened multiple times, maybe 100 already... first i thought its my wifi dat has some dc issues, but after happens so many times, i really feel otherwise. first, the dc of internet never happened when im playing games! most times it happens when im select champion. sometimes happened when i have client on but doing something else. i need to close the lol client for couple minutes then the internet will be back again. im pretty sure its something to do with the client. cause it happens so many times when im select champion. but never once when im in game!