Is here anybody else that it happened to him recently?
I had that problem around month ago, stopped happening after i've changed my password.
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Thanks, i never use the same passwords but i will reset my passwords just in case you could never know, better be on the safe side!
Someone may have used bruteforce or got it from somewhere else so do it and maybe also enable 2FA
It isn't possible to brute force Gmail since they have security to block your bruteforce attempts, since he also never used the same passwords, he might have a malware on his computer.
That's weird then as i'm sure i had no malware in my computer and i had that problem too, maybe i had the same password on some other site then.