Here is what I've been experiencing on a daily basis:
1. SABnzbd doesn't know how to fail a job anymore, it will continue on until the entire file is 100% then it will say it's not on my disk.
In the past, it would mark this job as failed and move to the next NZB. Instead it just mindlessly moves on with the attempted download.
I have "Abort jobs that cannot be completed" enabled
I tried to enable "Check before download" which didn't make a difference, currently disabled.
In Special settings I've enabled "no_penalties" but it shows "off"
I recently turned off Direct Unpack to see if that was a problem, that didn't help.
2. Because SABnzbd isn't marking failed jobs, Radarr isn't seeing that job as failed and will instead attempt to download the same file over and over.
3. Jobs will often get stuck at 99% with only 1-2MB of data left. In the logs it shows:
Resetting bad trylist for job
or
Resetting bad trylist for file
I have 3 servers, each with their own priority 0, 1, 2 and they all have a timeout of 20s.
I can't post the log because it contains "links" and I am a new user. I have the full debug file that I can attach.

