Navi has no correct position (Ceed SW PHEV)

Hello together, since this morning the Navi spins in my Ceed SW PHEV. It looks as if it does not know exactly where it is and in which direction it is going, although in the settings a Sat-Fix is displayed. The symbol for the car is on the road, however, the display moves in the wrong direction: instead of in the selected 3D display in driving direction from top to bottom, sometimes from left to right and sometimes from top to bottom. Also during the ride is completely unmotivated in the map zoomed in and out again. Furthermore, the speed limits are only correct shortly after the optical positioning by the system and after that no longer. In the UVO app the vehicle is not displayed at all. I have already made a reset using toothpicks, did not help. Are there any other tips? Thank you and many regards Kubi