For the past year (give or take), I have been experiencing an issue with the minidlna process reaching 100% CPU use shortly after renaming media files (audio or video). This has been observed across several different firmware versions but I am currently running version 4.2.21 on a Pro Business model.
The high CPU can be replicated and once it begins, it lasts for approximately 15 to 20 minutes. After approximately 3 to 5 minutes, the fans in the unit spin up to compensate for the extra heat caused by the CPU and become very loud.
During this high CPU period, the NAS shares are accessible although the NAS is slow to respond.
Any suggestions will be welcomed.