It sounds like a memory issue.
I worked with a system back in the mid 90's (The Management) I believe they are no longer around. Except for a failing 2 month old hard drive that corrupted some files it was really a good system. Thankfully it was covered by warranty. This was back before solid state drives. The disk had a couple of bad spots and the sectors affected where the commercials files were located. I ended up rerecording the commercials on a new drive. The production room didn't have a terminal yet so commercials were still made on carts and put in the system via the audition channel in the control room so it was easy to put them back in the system. We played music on carts and were transitioning to CDs. Fortunately the office PC had a good copy of everything else. A local computer guy showed me how to set up a mirror drive next week for a trade out.
Not so quick fix, assuming the system worked fine when installed.
#1 make a copy the troublesome file(s)from the original audio source. Renumber / rename it and have the system use that number/ name and see if it works. If it played OK, clone or copy everything on a new drive ASAP before anything else gets corrupted.
#2 get a new solid state drive (I would get 2 and mirror*) and start all over with everything put in correctly.
* I would get two drives from different manufacturers. Really good quality control will have identical products having similar lifespans. The chances of different manufacturers having the same lifespan are slim. I personally experienced mirrored hard disk drives die less than a week apart.