Client download some data everytime when i open client

since last snow patch every time when i open client and end of the match task manager show lol client download some data.every time download 100mb-200mb data.when i log in to account it start download data.but client did not show any patching note or did not show about download.but task manager show client download stop downloading around 1m-2m.And i start match and end of the match it start download again.this happen since 3 days.waste my 2gb data from my connection.why happen this? this issue happen my 4 friends
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