The Portal appliance 4.2 is going to offline very frequently (Emergency mode).
API Portal 4.2
If the /var partition fills, the machine will enter emergency mode.
If you are running an older OVA image than 4.2.3 you can increase the /var partition size to accommodate for the size of the journal logs that could get large over time.
Images newer than 4.2.3 should have a larger var partition defined.