Whats the latest version of the script?
The one I use is
#!/bin/sh
/usr/lib/plexmediaserver/Plex\ Transcoder2 -hwaccel nvdec "$@"
Here is an example of my problem. I scrolled the time bar on my iphone plex app 5 times and my Quadro got stuck at around 50% and my CPU was around 65%. I stop playing the file and it went down to 4-5% CPU and 0-2% GPU. But the Processes are still there.
Thats more than 5 min later and they are still there.