FileBeat EOF Error

after 2 days running, EOF came out also with the configuration without load_balance.

this is the stats from kibana -> I connected the filebeat log itself (it has been cut but the search is in kibana is "EOF")
it seems that they appear especially during night (off-load period)

I just checkd: logs are always the same as above, nothing on logstash side, EOF and ignore_older on FileBeat side (see topic https://discuss.elastic.co/t/filebeat-file-is-falling-under-ignore-older/61210/3 )

in filebeat i have lot of prospectors with this configuration

- input_type: log

  paths:
    - d:Logger\2
  exclude_lines: ["^\\s*$"]
  include_lines: ["^([a-z]|[A-Z])"]
  fields:
    catena: 11
  fields_under_root: true
  ignore_older: 10m
  close_inactive: 2m
  clean_inactive: 15m
  document_type: log2

general fb conf are the following

output.logstash:
  hosts: ["10.10.10.10"]
  template.name: "filebeat"
  template.path: "filebeat.template.json"
  template.overwrite: false

in LS i have the following

LS_HEAP_SIZE="8g"
LS_OPTS="-b 1000 -r --verbose"
LS_JAVA_OPTS="{LS_JAVA_OPTS} -Djava.io.tmpdir={LS_HOME} -Xms8g"

I've checked di JVM stats and they seems to be very good

LS1

LS2

LS3