Just as an update, bought an ikea tradfri outlet that stays always on and until now (2weeks) no more dropped sensors.
AS a curiosity, I bought to the button that comes with the outlet, but doesn’t have a DH.
So I have it as a thing, but when I press the on/off button the smartthings assumes that is xiaomi outlet (maybe due to parseReportAttributeMessage) and turn on or off my xiaomi outlet accordly without any configuration done.