Difficult to diagnose without looking at you playing. However, from my own experience, wrist problems when playing chords come from tension across the hand and playing with thumb orientation. If you can't play chords evenly (so that all the notes sound at the same time), you will have to practice this first very slowly and learn how to get rid of all unnecessary tension. Don't compensate by pressing hard, which will increase the tension.
That's MY biggest problem. How do you practice do get all notes in chords perfectly even? I absolutely cannot do this for anything.
Take a look at: https://www.pianoforum.net/smf/index.php/topic,9192.0.html
Just before I read that wall of text (Thank you!), what is meant "thumb orientation"?
Thumb orientation is when the thumb is aligned with the forearm, i.e. for the left hand, the hand is angled to the left. Thumb orientation is one of the most common causes for all kinds of problems.
Ah, yes, I see.so basically what I got from that thread is that to practice even chords, you have to repeat them slowly, keeping fingers on the keys, with a bobbling wrist motion until.. what? When can you start to involve the arm and different dynamics and voicing?