On my 2018 WK2 with Uconnect 4c Nav, quite often (not always) with a US pllugged into the media center, I get an error message that tells me the USB "no media files found" or to "connect device". I unplug it and plug it right back in and it works fine, even picking up with the same track it was playing before. When it happens, it happens when I first start the vehicle, works fine until I turn the ignition off. Doesn't happen every time. Using a 32gb SanDisk cruiser UBS v2.0. Any help?