FX30s entering sleepmode/low-power-mode/freezing constantly

Our FX30s with stock -power management is continuously entering sleepmode.
This only appears to happen when no USB cable is attached to the device (plugging in a USB-connector is enough, the cable does not need to be connected on the other side).

How can we prevent/disable power management entering this sleepmode/low-power-mode/freezing?

logfile is attached: logfile.txt (40.1 KB)

Running the stock Yocto build from URL
Release 14.0 incl. Legato

On a Legato forum the following post solved my problem: