Getting info from external web service works first time, fail then always with Errno 104

Configuration
1

Hi

I try to pull some information from an external web service and for some strange reason I manage to get the data the first time after an core restart but all calls afterwards return this error:
ERROR (MainThread) [homeassistant.components.rest.data] Error fetching data: https://website.com failed with [Errno 104] Connection reset by peer

The configuration I have added looks something like this:

sensor:
	name: avfall_papir
    value_template: >
      {% for entry in value_json %}
        {% if entry.FraksjonId == 2 %}
          {{ entry.Tommedatoer[0] }}
        {% endif %}
      {% endfor %}
    scan_interval: 3600 # once every hour
    resource: https://website.com
    timeout: 50
    verify_ssl: false
    headers:
      Host: website
      User-Agent: Home Assistant
      Referer: https://website/
      RenovasjonAppKey: XXX
      Kommunenr: XXX
      cookie: SameSite=None
  - platform: template
    sensors:
      avfall_papir_template:
        friendly_name: Papiravfall
        value_template: >
          {% if states('sensor.avfall_papir') in ['unavailable', 'unknown', 'none'] %}
            {{ states('sensor.avfall_papir_template') }}
          {% else %}
            {{ as_timestamp(states('sensor.avfall_papir')) | timestamp_custom('%d/%m') }}
          {% endif %}

When I try to pull the same data with the application “Advanced REST client” it always succeed and return the following data:

[{"FraksjonId":1,"Tommedatoer":["2021-04-22T00:00:00","2021-05-06T00:00:00"]},{"FraksjonId":2,"Tommedatoer":["2021-04-22T00:00:00","2021-05-20T00:00:00"]}]