My theory is these titles are coming and going perhaps even without us realizing it. So I reorder my queue and then some point soon after Psych is pulled from my queue and then added right back in so it is always at the last position.
Of course that is just a theory.
I do not believe that is what is happening. I had added all the Charlie Chan movies that are available for streaming to my queue earlier today and then sorted my queue by title and verified that the movies were in true title order both on my Roku and the web site. I just watched two of them and deleted each after they were done.
After watching and deleting the second one I noticed that there were NO more CC movies at the current position in my queue so I scrolled to the end of the queue and there they all were. Also there were a a couple of other movies and a couple of series all unrelated to the CC movies and from different places in my queue. They were: Have Gun Will Travel, Dexter, Romancing the Stone, and The Girl with the Dragon Tattoo. (OK, so I have somewhat eclectic tastes.)
Except for the CC movies these have all been added over a week ago and Have Gun Will Travel is the only one of these I have ever noticed showing up at the end of my queue before. There have been others. This has been happening since before the latest update.
I agree this seems to be a Netflix issue but it could also be related to the manner that the Roku deletes objects from the queue.
Also my queue is fairly large, 239 items at this time, and I wonder if this could be related to size.
I hope that this gets fixed but at least now that I know what is happening, what not why, I can deal with it.
Edit to add:
This morning I found that several titles, Farscape, Torchwood, Hunter, Terminator SCC, Dexter, and Have Gun Will Travel, had all been relocated to the end of my queue. Overnight I had not accessed NetFlix at all. It seems that there may be merit to the "title removed and added back by some mysterious process" theory. That would explain what I am seeing.
It looks like all the titles that were relocated today are series that have had their episodes combined however that took place some time ago and I do not know what that could have to do with the issue.
I, for one, would like to know for sure why this is happening and what I can do to prevent it. I like to keep my queue in alphabetical order so I can find things with fair ease and this is making that unnecessarily more difficult.
I wonder if this is happening to those that do not have a Roku. Also it only seems to happen to my instant queue as my disk queue's order has not changed.