F7, 19.34, altitude calibration failed (DEM)

Hi,

today for the first time w/ 19.34 I tried to calibrate altitude with DEM and unfortunately it did not work (18.16 was ok).
I also tried reinstalling TopoActive maps via GE but that does not solve the problem. I assume at this point that the file is damaged therefore how can I repair it? It seems that the more I use this watch, the more annoyances are triggered...

TIA

F7, 19.34