Issue with Card-mod sometimes not loading - in combination with Lovelace Kindle Screensaver

hello everyone,

i am using Card-mod to create a Dashboard which in turn is turned into a png file for my kindle by Lovelace Kindle Screensaver. I am pretty sure some of you might be using something similar.

i have the issue that sometimes card mod does nto seem to load well.
it was working some time, but i am not sure what caused it to stop working. maybe it was an update, but i also had to do a lot of rebooting for my system and i could have f***ed something up. I truely do not know.

I am running 2025.2.5 with Card-mod V3.4.4

my config has this part in it

frontend:
  extra_module_url:
    - /www/community/lovelace-card-mod/card-mod.js

i have confirmed the location of file. also i think it would not work sometimes if it was wrong. or would it?

does anybody have an idea what could be going on?