Leaver Buster warning when I'm not afk or leaving.

I have been detected by the leaver buster system when I havn't afked or left a single game in the last like 40-50. Why did I get a warning that I've been afking and leaving too much? Is it from teammates reporting me for being afk? because i'll be sitting there waiting to buy an item but i need just a little more gold so i wait for it, are people reporting me afk for this? and is this why i'm getting leaver buster detection? last time i got it i had to wait 20 fucking minutes before i could enter queue. this is bullshit. now i bet some idiot can report me when for afk for no reason at all and i'll probably have to wait 30 minutes for 5 games before i can queue. the system is garbage. riot needs to stop being lazy and have actual humans do the work instead of these robots who just collect numbers and shit them back out.