I found this thread because my father is also experiencing these absent states. He is 90 Years old, advanced Parkinsons, on palliative care. I am not too bothered by the episodes as his cognitive abilities have been declining and this is just another thing to add to the list. His episodes can last up to 6 hours, which seems a bit longer than other posts.

His neurologist told us a few years ago that he could not do anything more for my father and that there was no need to make any further appointments. We should just try to keep him as comfortable as possible. So, I don't have anyone with the expertise to tell me what is going on. I was hoping to get some insight here.