NAS dissapeared from Network Devices

Hi everyone
I have a Mac Retina Pro running OS X 10.9.4 (13E28). I recently bought a Synology NAS (DS214). I enabled the Mac file sharing Service on it and it worked fine for the first couple of weeks. But suddenly a couple of days ago it is no longer available in the network devices... There is no firewall enabled and it's on the same domestic LAN. And I can actually reach the NAS using the GUI on the browser. Everything is up, it is just not available anymore on my MAC. And just on this Mac.
Not sure if related at all, but this is consistent with a very annoying behaviour of the MAC against external drives in general... I already have 2 external disk (one WD and the other Seagate) drives that just stopped working on it. Nothing happens, and they are never displayed when the USB is connected after using them succesfully for a while. Though if I connect the same external drives in other personal computers (including similar Macs they come up just fine). This is something else I need to fix as well, but probably in a separate thread..
Still wondering if some kind of device info is screwed up and how can it be reset if appropriate.
Thanks
Joao

Cisco works , HPOV is the best in heard

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