For no particular reason i turned on the Midi Monitor function in Studio One 7 and discovered that there was an absolute flood of sysex messages streaming way faster than one could read. They are all "Sent" sysex messages. If I filter out the Sent messages the sysex flood stops. The DAW is otherwise silent - no running projects just a blank generic Studio One 7 template on the screen. No reason for tons of sysex to be pumping out as far as I can tell. The keyboard functions fine. No hint that anything is definitely wrong although I have noticed some small delays or decreased responsiveness in the DAW when using the S88 (which is to say all the time). I noticed that if I go into External Devices in Studio One and disconnect the "Send To" midi from "Komplete Kontrol DAW" the sysex stream stops cold.
With just limited testing I haven't found that disconnecting the Send To has any detrimental effect although Native Instruments clearly indicated that Komplete Kontrol Daw should be connected to both Send To and Receive From in Studio One external devices.