300 ping

hey guys i play in Eu west and i have been playing with a normal of 90-100 ping.this morning i got 300 ping from the start of the game i said it's maybe a lag spike and it will be gone after few minutes but it didn't and froozen on 290-310 all game long and from that game untill now it's just like this and i don't know what to do about it.I thought it had something to do with the connection but when i download something it downloads with normal speed i played other online games to so i make sure that the problem is in LOL only. thanks for reading and i hope someone find the answer or the way to fix it
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