I don't think without reason mod will ban some one. There must be reason. Every one excuse after ban, I didn't make any mistake. Btw mod. can clear your issue why they ban you. May be you spam and some one report your post or copy paste from other post.
Usually, if users get banned or blocked for any reason, they will receive an notification but I have not received any notification and the reason I got banned.
That is too bad.