Which disorder is characterized by persistent episodes of depersonalization?

The disorder characterized by persistent episodes of depersonalization is indeed the Depersonalization/Derealization Disorder. This condition is defined in the DSM-5-TR as involving recurrent experiences of feeling detached from one’s body or mental processes (depersonalization) or feeling detached from the surrounding environment (derealization).

Individuals with this disorder often describe a sensation of observing themselves from outside their bodies or feeling as if they are in a dream-like state. These experiences can be distressing and can interfere with a person's everyday functioning. The persistent nature of these episodes is essential in distinguishing this disorder from other dissociative and somatic disorders, where such sensations may not be chronic or central to the diagnosis.

In contrast, Dissociative Amnesia primarily involves an inability to recall important autobiographical information, typically associated with a traumatic or stressful event, rather than ongoing feelings of depersonalization. Dissociative Identity Disorder is characterized by the presence of two or more distinct personality states, not specifically by depersonalization episodes. Somatic Symptom Disorder focuses on physical symptoms that cannot be fully explained by a medical condition and does not encompass the dissociative experiences of depersonalization.