I'm not saying you do, if you were thinking that I was. I was only giving those as examples to say you should not do anything at all questionable like ignoring the game and only farming a lane which isn't mentioned as a specific example of rule violation but is something that people may report you for giving up and waiting until the game ends because you are already at 3 strikes right now and don't want anything valid to be reported. We don't want to touch anything; it's fragile .
And I'm saying not to ever, ever do anything questionable at all, ever, because...
DISCLAIMER: This is based on what I have read on the boards. I cannot find any official statements. I cannot attest to accuracy or that they are matching Official Riot Policies. It would be nice if Riot stickied them or something.
...it keeps being said that in order to move down a tier you have to show improved behaviour in many games over a time. I have concerns that since it was due to chat, and you are not using chat, you wouldn't be showing that much improvement, you know? But I don't know. As for time frame, I have heard some say three months per, but others have said that it's about amount of games and amount of improvement and I would think the latter is more likely. After all, it doesn't make sense that someone just not play for a few months and be "reformed", right? And I do recall someone did get banned because he went right back to harassing his teammates for losing after taking a break from the game.
I would say to contact Riot Support and ask them for the specifics because I don't feel comfortable declaring anything because there is no resource I can find to reference or point you to.