Firmware updates should be treated as a last resort in all cases. Unless the problem continues, or there were critical security updates in later firmware versions, it's never really advisable to suggest a firmware update as the possibility of bricking a device is not one people (nor businesses) want hanging over their heads.
Ultimately if something is working, I'd recommend leaving it be.
Everyday I get into my router to check for an update, hoping that there is one.
I guess im just different