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You could keep your fobs in a faraday box or bag/pouch when you're home or at work to block the fob from sending unintended signals to the car.
For users experiencing this problem, you can determine whether the problem is fob-related by placing your key fob in a faraday pouch right after you lock the vehicle. If you no longer come back to a car with the hatch open over a long enough period of time, you can safely assume that the problem is fob-related. If the hatch continues to open on it's own while the fob is secured in a faraday pouch/box, it's likely a problem with the car itself (BCM, power liftgate module) or RF cross-transmission (or possibly a latching mechanism issue as TDK1044 mentioned).