Naim streamer reboots randomly

I have a ND5XS and acesss files on my Synology NAS via Minimserver. It worked perfectly for months, then suddenly started to randomly stop playing and reinitialize back to the "select Upnp server" menu. It seems to occur more often while playing DSD files, but also happens while playing Flac files of all resolutions. I start an album on a loop and it will happen sometime between 1 and 5 loops. I sent it in for service and they returned it (after 6 weeks) saying nothing was wrong. I've double and triple checked all the Minimserver settings, but don't really see how a upnp server would be the cause of my Naim streamer rebooting. I am testing with a USB stick right now, but expect the same result.

Any ideas of anything I can try, short of sending back for service?

Thanks