I have contacted the Shelly helpdesk about this issue.
Their reaction:
ZitatFrom that topic, we can see that all of the customers are complaining from the ripple signal.
There is no solution to it for the moment.
Thank you for your time!
Shelly still has some lessons to learn if it comes to customer centricity.Would be nice if Shelly makes sure that their products are functional instead of developing tons of new products.