my account password gets reset every day

Hi there, i've been playing League Of Legends quite a lot recently and getting ready for Season 8 but every day at around 2/3PM GMT my password will randomly go from what i have it to, to something that i do not know, i've checked my email, changed my email password, added 2fa to my email and it seems to still happen. Just interested as to why this is happening and if there is any way to fix it. Thanks for reading and i hope you can help me!
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