Windows shutter/curtain switch closes without demand


Having problems with several window shutter/curtain Smart switches, model kingart (as in picture).
After working perfectlly for a while, they start closing the shutters automatically without any demand.
It is not a overall power failure as not all switches will close, only the ones malfunctioning.
After starting with problems the malfunction persists and shutters keep closing without order frequentlly.
Checked also the switch connector weldings as in some case they do break when too much force is applied on screws.

Anyone with the same issue?
Any solution?
Is there any way to eliminate the function to close whenever there is a power failure?

Thanks in advance!