After unhitching from any of my three utility trailers I get a warning on my dash that says Trailer Disconnected Check Connection. This warning is supposed to go out, according to the owners manual, in 30 seconds. The warning does not go out until I turn off my pickup. I do not know of anyway to "Dismiss" this warning other than to turn off my truck. I took the pickup to an area Chevy dealer for a few issues and regarding this issue I was told if the computer updates that they addressed doesn't fix it, i will have to wait for another computer update at a later time. My Trail Boss is a 2021 so I can't believe that a problem like this is not yet covered in a computer update. Just wondering if anyone else has had this warning issue.