Hi. My Partner Has Experienced Very Infrequent Episodes But Has

Hi. My partner has experienced very infrequent episodes but has just had it twice this morning. Symptoms - Loss of taste, almost an out of body experience like he is looking back down at his body, dark thoughts. When experiencing this he becomes unable to function and even to talk. He finds it difficult to describe. It tends not to last very long. Any ideas, Thank you Very Much - Kind Regards Melissa