Corruption of static HTML, javascript and css files

We're seeing some very odd behavior where local static content randomly being corrupted. Image files, html and JSP files and other dynamic content is being generated without issue.

I have only been able to reproduce in a single environment that includes F5s between the user and the undertow server and have not been able to confirm the issue is undertow. Looking to see if anyone has encountered this? Our implementation recently upgraded to 1.3.25 from 1.3.20 where we didn't see this behavior