How are you feeding this cat, while you are gone?
Get someone to take care of the cat while you are away. Either relatives, friends or some kennel/petcamp. You will feel better knowing the cat is in good hands if it's condition should worsen and the cat will feel safe.
Matter sounds neat and all, but it's still wireless on the 2.4 GHz band, so it will still have the same amount of noise that Zigbee does.