my experience has been competitor flagging with illegal software. the software runs a program that picks up key words in your listing. just look for others in your area doing the same thing, they may be the reason. no harm in emailing them and telling them to quit it or you will take legal again and pursue damages for them interfering with your business, which is against the law.
next check your own posting behavior. if you posting your listing in more than one location or category or your posting it more than once in 48 hours or more than one time, YOUR AT FAULT AND SHOULD BE FLAGGED.
my experience is sometimes c.l. destroys you but usually its some local tool who is generally breaking all the rules themselves, but will not allow your to do it (someone bound for hell). in which case you have to figure our who it is and best recourse is a letter from a lawyer, stating laws they are breaking and explaining what will happen if they continue and there is plenty you can sue them for. i have been through all this. and have consulted lawyers for help.
usually behind is all is some greedy evil person who you have to cross check with threats of a lawsuit. be careful to shield yourself, these tools will then try to ruin you other ways. i have had slander posted against me, phone and sales appointment harassment. in my situation i never broke any rule or hurt anyone, the jealousy envy greed and evil venom was demonic. soon these types are destroyed but you have to stand your ground and never let them win. fighting them with the law is best because these types are lawless, monetary threats are fun.