DAW CK drivers has an "auto re-connect " feature embedder enabled by default, which should per the name, automatically try to reconnect uppon such failures (unexpected connections loss) .
Auto Reconnect (dataaccess.com)
Maybe, error 12289 is not in their list of possible errors to trigger this ? the only example they report in this doc, is for error 12343, but it does not say it's the only one that is covered..
Question to CK team I guess.