menubackend moveToLevel(lvl) resets uno

Using Arduino Programming Questions
5

I still haven't worked out hwy it resets the uno but I needed to move on so instead wrote a while loop to work its way back

 // menu.moveToLevel(0);
    
    while(menu.getCurrent().getLevel() > 1){  // if we're not at the bottom of the menu
       if(menu.getCurrent().getLeft() != 0){  // getLeft returns a route, we should follow it
         menu.moveLeft();
         Serial.println("  L  ");
       }else{
         menu.moveUp(); // go up and we can try again next loop
         Serial.println("  U  ");
       }  
    }