Sonarr version (exact version): 4.0.9.2244-ls257 by linuxserver.io
Mono version (if Sonarr is not running on Windows):
OS: Ubuntu server 24.04 LTS - docker
Description of issue:
I set up multiple series but nothing downloads, or it sometimes I get downloaded after a few days or weeks. its random
Have a read through the FAQ, specifically the first few questions on how sonarr searches for episodes. That might answer your question.