If you are playing with a reputable casino it seems you don't need to get worried that they will freeze your account but of course there's a possible reason behind on it, possible issues if that you will encounter of course if you haven't read their Terms and condition if you are an active gambler you want to make yourself safe too so its your rights to read those. Possible common issues of the accounts suspicious activity in different form, abusing the game, multiple account using same IP, and etc. If you think you didn't do anything wrong you don't need to worry. If you are playing a casino that has an existing ANN thread here you can easily reach out their representative with your concern but of course with an evidence.