Lost frames when triggering csi camera externally

I have two Basler CSI-2 cameras attached to a JetsonTX2 which I trigger with an external GPI signal (5MPx @ 50 fps). Everything went well until I changed the default power mode from “MAXP CORE ALL” to “MAX N”. Since that action I get a significant amount of dropped frames. Switching back to “MAXP CORE ALL” doesn’t help, the problem remains. I suspect that the bus arbitration somehow has changed when I modified the power mode and I wonder how I can set it beck to its default state, or whatever I have to consider to not loose nay frames in my setup.