Reservation suspended may be either temporary or permanent. Normally when it is temporary, please try again after some time. Maybe the train reservation has crossed all fixed limits, or there is a going to be a change in timings/dates of run. Generally it is the first point: the booking has crossed all limits fixed for the train.
Cancellations/Re-routing of the train happen rarely, but is very much possible. Generally this happens close to the date of the change in time table or due to some problem with its connecting rake running inordinately late. But this is rare. They announce it in public news domain.
Please...
more... try again after some time, or after a day.
Good wishes.