Music Library (Minimserver) No Longer Visible

[Afveep]

Running a Synology DS412+ with Minimserver for a couple years as a music server, all perfect. I have been out of town a couple weeks and have come home to find that my music library is no longer available on my network. NAS is up and running; MinimServer running and can be found by MinimWatch. I've re-booted everything and stopped/started Minimserver. NAS volume is visible on my network. Not sure where to go from here. I've done all updates I'm aware of, but maybe something is messed up with java? I did do a java update sometime before I left but I THINK it was OK- not sure.
Here are details:
DSM DSM 6.0.2-8451 Update 1
INTEL Atom D2700
Minim server 0.8.4.1
Java 7.0.111-0011

Thanks for your help Simon.