Looking for a heavy duty power plug

Ok, than they lost their connections. Have you checked if a new firmware is available?
A FW update can be done with an Aeotec Z-Stick Gen5(+) and the Aeotec Homey App without deleting the Qubino Smart Plug from Homey (instruction).

Btw Aeotec. From Aeotec there was once the Smart Switch 6 also with 16 A available, but this plug is end of life. However, it may still be available.

Just as info regarding my first question: I have the Qubino 3-Phase Smart Meter in use and I have to send every 5 minutes a Z-Wave basic command, otherwise the data would no longer be updated. When this happens the device is still connected but the data are “frozen”.

As I already suggested, I would contact Qubino. They have also a own forum topic (link).