My Deco X20-4G looses its Internet connection regularly. This is a major problem as it is placed in our summer house where we only stay during the summer. That means that all connected devices for alarms, heating etc. loose their connection and can't be monitored or controlled remotely. 

This connection stability issue with the Deco had existed for years, ever since we bought the Deco. We have exchanged the Deco for a new unit, but the problem remains. We have updated the firmware, but the problem remains. We have requested TP Link to add a reboot feature, but it has not been done  (despite that TP link has said that the feature will be coming).

As of now, the only "solution" is to connect an external timer that turns the Deco power on and off.

Bottom line: the Deco X20-4G is a useless unit as it stands now. It is unstable and it lacks basic reboot functionality that could otherwise be used to make up for its poor connection stability.