ESPhome sensor wifi_signal ignores update_interval

Got a funny problem I can’t solve.

A couple of ESPs 8266 aswell as 32s.
More or less all share the same code when it comes to the

sensors:
  - <<: !include common/sensor/wifi.yaml

where this yaml contains

  - platform: wifi_signal
    update_interval: 30s
    name: ${vname}_wifisignal
    unit_of_measurement: 'dB'
    accuracy_decimals: 0
    icon: 'mdi:wifi'
    filters:
      - sliding_window_moving_average:
          window_size: 16
          send_every: 8

This works ok for more but 10 different ESPs, only 1 is giving me a headache since if lucky the wifisignal gets seen by HA once within 5mins if ever.

Only differnce between the other esps is that I added 2 custom sensors using the

  includes:
    - custom/veml6075.h
    - custom/mlx90614.h
  libraries:
    - "Adafruit VEML6075 Library"
    - "Adafruit MLX90614 Library"

within the esphome: section.

Anyone with an idea if these could be part of the problem? Afaik each sensor comes with it’s own update_interval, means if the wifi signal is defined with 30s I expected a value renewal each 30secs.

TIA for a hint