Hi rf_unitem
I have tried running 3 cameras on the ORIN we have at our office, ran it over weekend, had no problems. Its the dev kit version that has a 19V power supply; perhaps there is a power issue on your orins...
RIght now, the device is used by some other testing rig, so I can't make further tests, but will probably plug in 4 cameras over weekend, to see if it makes difference.
Thanks,
Jaka