Have the non-aqara (round model) ones and they work fine in the fridges and freezers. Even in the shed which is over 12 meters from Homey with HR glass and walls in between. Only drawback is the battery life that is shortened by the cold.
I think outside they will be fine as long as they are not in the direct rain or snow. If they would be, then maybe you could put it in a water resistant wall box or something like that.
I use the Neo Coolcam V2 now, and happy with that one. Only the zwave range is a bit limited, but it is in the same room as homey thus working fine (for the rest I use Philips Hue, Ikea Tradfri and Xiaomi, and that’s all zigbee).
If the sensor is unresponsive, sometimes it is just enough to press the wake-up button to get it working again. If you just reset it (without proper disassociation from Homey) you can’t add it again until you removed it. You have to remove it from Homey, then reset the device and then you should be able to add it again.
Zigbee devices that are powered by 220 are mostly capable of acting as a repeater. For instance Zigbee plugs or Hue or Trådfri bulbs. Or you could buy a specific Zigbee repeater.
You can reset the Zigbee network, but if you do that, all devices and settings will be gone and you have to add every device again. Also every flow associated with a disappeared device has to be repaired.
I myself have no experience with the Xiaomi door/window sensors, only with the temp sensors.