Having the same issue. Can't figure it out.
Factory reset worked for me only once. Next day, the same problem... (Galaxy S9)
On Android forums, many people writing about this issue; but not only Samsung users. Many other manufacturers' phones have the same issue. It is caused by an update in last week. I wish Samsung have tried these updates better and then present to us...
got the same problem wake up a week ago plug my cell phone into the usb and android auto keep restart my phone can't figure what it is I reset my phone to factory setting didn't solve the problem reset de radio as well and didn't fix it ether don't know what the problem is