I experience a strange behaviour of the Jetson Nano when powering it with a bench supply via the barrel jack. We tested two different bench supplies with three different Nano boards. All boards turn off ( ie. the power LED goes off and the screen goes blank ) some time after booting, usually a second after showing the login screen. The bench top supplies are rated 3A or even 5A and there where no other peripherals connected to the Nano. I monitored the power line with an oscilloscope and there was not even the slightest power level drop visible.
When I power the Nano with a really cheap wall wart rated at 2A, it just starts normally and stays on as expected, even though this supply drops to about 4.9V.
Has anybody an idea what could cause this behaviour?