I decided to move my entire plex library over the channels in chunks of about 50-60 movies at a time. everything was going fine until I noticed that all of my clients (hardwired or wireless) would freeze after a while. I removed the source that had all of the movies on it, the channels dvr (linux) server then started acting like it was frozen (web ui). I rebooted the sever (took a really long time) and then now everything is back to normal working perfect.
I thought that Channels can now support much bigger database? I remember that it used to choke but I was pretty sure I read that it was a thing of the past.
I submitted server logs to see if they might shed some light. I probably added about 600 movies all total over 2-3 days