I've got this strange behaviour happening where my Sitecore log files are not being updated at all unless I restart the app pool, then it seems to flush all the stuff that's been going on into the logs.
I've seen this happening at a couple of clients where I've been working, and I've never had the time to investigate it and sort it out.
The server it's currently happening on is running Sitecore 9.0.2.
Has anyone else seen this happening? Got a fix?