Yes. While MdDS most often presents after a motion event (typically travel), about 20% of cases do not have a known causal event, i.e.: lack a motion trigger. A connection between spontaneous onset and migraine, stress, or other non-motion event has been suggested but further research is required to make any correlations.
Suggested Reading
Cha YH. Mal de Debarquement. Semin Neurol, 29:520-7, 2009. Review.