Dear Swarupa, you need to lock your choices. But by any chance if you have missed locking your choices, or you are unable to lock your choices,  the choices submitted and saved by you will be locked by the system at 5.00pm of the last day of locking. Remember that you can modify, add or delete your choices only until you lock them.

Dear Student,

• The Server of MCC about choice filing can be sometimes unreachable or just like your question, it can be glitched as the inactivity of a button or buffering during loading or delay in displaying the colleges because of traffic on the website and many other issues involved.
  
• But not to worry as you can edit your choice during the time window provided by them and as you have also mentioned in your query, the answer is yes, it will be automatically locked after that particular time window expires.
• Thus if your choices of desired colleges do not get locked, they will be locked when the time expires and the last edited choices will be considered and among which the admission will be provided on the basis of the Merit list.
• And also if you observe well, this specific information is also mentioned on their official website as well and thus you do not need to worry but you should check them the day before the time window expires for confirmation about your choices.
• lastly, a caution about that you should fill the colleges with having all the information about the desired colleges which you choose (We can help you with that) and you should not change them frequently in order to minimize the chances of error and conflict.
• If you have any other questions, query, problem, issue or doubt about Choice filling, Admission and verification Process, Colleges, Doctors, AIMMS, JIPMER, NEET, etc; you just need to ask a question as a separate query.
  

I Consider your query has been solved.

Best Wishes!!