Does it go on all the time or does the frequency vary? Have you noticed anything else associated with it such as a period of higher stress, time of day, how tired, dehydrated, or hungry you might be? Keeping a symptom journal might help. There may be definable triggers for the behavior that would help figure out what's going on. Could it be related to medication?
Check in to tardive dyskinesia:
https://my.clevelandclinic.org/healt...ive-dyskinesia
More avenues to look into:
https://www.medicalnewstoday.com/articles/322174