I see this morning that Synology have a new update called DSM 6.2 in the hopper & will be releasing it to different regions over the next days.
… www Synology Support ... There is a lot going on, the vast majority is business & security & I can't see any obvious issues or anything new with the NAS UPnP audio side. A new user interface is included in DSM 6.2 & a new Media Server software version 1.7.9-2858 is required; this is being released at the same time as DSM 6.2 – I'm not sure if Minimserver is ready to go with this or not. You might want to check it out with simoncn @ Minimserver before it gets either auto-updated to your NAS or you see that its ready to be updated.
Worth noting that this will be the last DSM platform update for older products – this is basically 2013 models & older – they do say that support with vital updates will continue for a further 2 years.