[BK7231N] Mini Smart Switch Reboots When Activating Relay via Wall Switch

I have a [BK7231N] 16A Mini Smart Switch from AliExpress with a strange behavior. It is connected to a simple wall switch on S1 and S2, and when it is in one of the positions and you activate the relay, the device restarts itself. In the other position of the switch, the system works correctly. This happens to me on two identical devices, with the same configuration.
Wiring is typical for these switches:

The configuration is extracted through the GPIO dump, and I am using ToggleChannelOnToggle on the same channel as the Relay (1).

Any help is welcome.
Best Regards

Those devices are often coming with a very low quality power supplies. Please try to use PowerSave 1 and then recheck if it still restarts on relay toggle.

Thanks. I have tried, but it restarts as always.
I think it is a design error because two of them present the same behavior.