why do i sometimes get disconnected from the game?

happens only like once in 3 or 4 games when at some random point in the game everything freezes with the message "attemtping to reconnect" showing up. Since im used to that everytime i see it i leave the game and try to reconnect, losing about 2 mins of game time and falling behind. My internet is fine everytime i check it when this happens. Ive only been having this problem since last year in 4 years of playing league. How do i stop this?
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