Just as a data point on this issue, my 24 built in September and in my hands on October 30th does this, ususlly around 2-5 times in the first 5 minutes and then stops as near as I can tell, and iirc, new units come with the latest updates available at the time of manufacture give or take, so it would seem that it is either a new fix or it's still broken. It does have all the markings of a software glitch, so maybe one day...
Until then it isn't a huge deal for me, I try not to start "singing along" until after it is done with its tantrum!