Yes, pretty common to have the portal be non-responsive when there is a change in the system or a deadline has passed.
In this case:
1. Deadline for ranking your preferences passed on Jan 18 at 5 pm
2. They don't want anyone to think they can still go change their minds/change their order
3. TMDSAS will be entering the Match results data ready for y'all to view on Feb 1.
The system may jam up when you all log in at 8:01. Go have a cup of coffee or do 50 jumping jacks to burn off your anxious energy and come back to try again