Hi @msp1974,
For an easier following, I document here the problem I have with my energy sensors which return to 0 randomly and broke my energy dashboard filtered by device (Cf discussion in the blog here : https://community.home-assistant.io/t/drayton-wiser-home-assistant-integration/80965/3625)
As you can see below, I have the consumption of my wiser heater energy sensors which randomly return to 0. (Here the consumption of my bathroom heater)

And the problem is that It detects a new cycle for my energy dashboard :

It can be seen below that a behavior has changed (around April. While consumption was continuously increasing before April) :

Many Thanks for your help