I seem to have solved my random disconnection issues by running HA on a spare Tinkerboard i had lying around. Been working for almost two weeks without issues so it’s looking good.
I do have an issue with my Philips hue lights though: they were paired with the zigate before i switched to the Tinkerboard, but I cant figure out how to reset them to re-pair. From what I read it’s just not possible (which seems rather silly), outside of buying a philips hue bridge. Does anyone know of another way to reset them?