Software problems of the 2016 Cadillac XTS

For the past 3-4 weeks while driving, the cue system will start to beep, change pre-set radio channels and the screen will freeze up. The beeping still continues. After a short period after turning the vehicle off it is fine but begins the same symptoms after about 5-10 minutes of driving. I brought the car to the dealer where they made it appear that they had little or no knowledge of any problems. I informed them I've been in the auto repair business and am very familiar with all the cue complaints. The car was kept for 4 days and then I picked it up. I was told it was a simple software update which I replied to the service advisor that I didn't think so. (I guess my experience in business means nothing!). I drove away only to have the same issue after about 5-10 minutes of driving. It took 2 weeks to obtain another appointment at the dealer. I asked if they have the part and was told that the part was a special order, blah, blah, blah. . . But what caught my attention was that the service advisor said the part has to be ordered from a third party. Not gm. This may be the reason there is no recall yet. I'm returning the vehicle on 12/17/2018 and would love to be able to add to this after the outcome which I was told would take about 4 days.