Aqara (specially older devices) are known for being temperamental and not playing well with other hubs/devices. If you have each manufacturer on its own hub, make sure they are using separate channels. If everything else fails, 2.4GHz is also used for Bluetooth, microwaves and other, maybe your location has noise on that band,

Z-Wave is using lower bands (800-900mhz depending on location) and certifying the devices better for software compatibility. It's a fine solution as if it works for you, any limitations are basically theoretical (like the 200 devices).