This sounds very similar - see this
Mine came back after awhile - at least several hours. It is a C7. Maybe leave it alone overnight and see if it fixes itself like mine did? Not a solution, just more data.
This sounds very similar - see this
Mine came back after awhile - at least several hours. It is a C7. Maybe leave it alone overnight and see if it fixes itself like mine did? Not a solution, just more data.