@Tlse-vins Oh I see, I made the connection, it’s the same issue that @spenceur is experiencing on the homepage, in fact you must have quite loaded devices and on the Gladys Plus side there is a limit on the size of messages! (see [RESOLU] Probleme creation de graphique sur Gladys+ - #24 par pierre-gilles )
I created a GitHub issue, and I will investigate on the Gladys Plus side: