Mysterious beep after Recall Update

[CmariePurple60]

I purchased my 2018 PHEV last September and have driven it without any problems for 5 months. It now has about 7250 miles on it. Last month, after I had the Recall done at my local Mitsubishi Dealership, an odd tone started sounding, only one short beep through the speakers that slightly mutes the radio, and no associated light warnings. It had not happened before the Recall was done on the computer. I rarely use the SatNav as it is rubbish. It happens at slow and fast speeds, straight roads and curved, and there are never any lights. Tonight, I used the SatNav to see if it was the "approaching curve too fast" issue, and it never sounded. I drive very conservatively. Any ideas?

 

[Darkflow]

I occasionally get that as well, but assumed it was just the "approaching curve too fast" warning. I pretty much drive like a grandma though, at least in the PHEV, so if it is that, it must be very conservative.