Right so I've been documenting this kind of thing for about fifteen years now and cabinet activity is actually one of the more consistent poltergeist signatures people report - not the dramatic stuff you see on telly, just persistent low-level manipulation of objects in domestic spaces.
Few things worth ruling out first. Warped wood and temperature fluctuation will cause cabinet doors to swing open, especially older units. Humidity changes overnight when heating drops off can do it too.
That said, if you're hearing the click of the catch releasing and the door is found fully open in the morning, that's mechanically harder to explain away. The latch has to be actively disengaged.
What I'd suggest is setting up a camera with night vision pointing at the affected cabinets and also running a digital voice recorder in the same room simultaneously. You'd be surprised what turns up on audio that the camera misses completely. Post whatever you capture here and let people have a proper look.
Also worth noting - is anyone in the household going through a period of stress? That correlation keeps coming up in the literature and in my own fieldwork.