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Hi
I have simular problem with a cronjob in one of my modules, which produces a lot of small files with only a few bytes.
And if I have to much files, it is also a problem to delete them via filezilla.
Did you already try to get access to the folder via your hoster software (e.g. Plesk or Confixx file manager) and to delete all files from there at once?
if it works and then files appear again (maybe every hour a new one) then check for cronjobs