i believe that the connection with the arduino occasionally breaks down
bugs in the arduino lisp code are really a problem
i fixed some of my bugs and the cameras can now run quite well while being triggered
but apparently there are still issues:

Camera 0: Basler acA1920-25gm#00305315DFDD#192.168.4.100:3956
GrabSucceeded: 0
acquisition error.
Error: 3774873620 GX status 0xe1000014Camera 1: Basler acA1920-25gm#00305315DFDE#192.168.5.102:3956
GrabSucceeded: 1
SizeX: 600
staggering the trigger pulses for the cameras doesn't seem to help much
acquisition seems to work with occcasional hiccups but the data doesn't look as before
triggering works with basler pylon viewer
i had to change integration times and the aoi of one camera
read out gain and exposure time
acquisition seems to work now