You know it dawned on me that the behavior might have been some type of test but there is no mention of it in the manual!
I pulled the impeller cover and sure enough there was some stuff caught on there. I also noticed one set of tracks had some stuff tangled in it. It looks like polyester filling. Not sure where it came from but I'm going to clean the heck out of it.
I'm also intrigued by these track bearings. Is this something that is serviceable?
I "assume" it is similar to all the Dolphins I have seen other than the newer S200, 300 style units... If so, each side has several bearings that the track rolls over.. If you are at all handy they are easy to replace.. The ones that I have done, were a pain to get to all the screws, but simple to repair..
I suggest you go the Marina pool and spa and check out their repair parts.. They should also have a parts breakdown for your Dolphin..