Following Karst suggestion I was able to re-establish connection with the DR 5013
Then I modified the settings as you recommended :
1) decreased the short circuit delay ( from 200 ms? to 50 ms in both DR5013 and DR5000),?
2) changed? DR5013 "Report short-circuit" from BOTH to NONE
Now thanks to the help of you all I can run trains with Rocrail in AUTO mode again
botter