It’s possible that the processing required for the files is too much for your H/W
Let's start with a debug log (See my signature) and if possible the url from "top -b - n 30 | paste" when one of the HDR files is playing.
Here's the log, I wasn't sure what you meant by "top -b - n 30 \ paste", sorry. Let me know if I need to do it again. I tried posting the log in a spoiler, but it was too long, so here's a link. Log