Please help...subnet and rescan issue..drive mapping

[sam]

I'm at my wit's end.....I'm using a QNap with Minimserver to play music from my Naim NDX streamer. It's been in use for about a year and it's been sweet...sounds great and then..... about a month ago Minimserver stopped working in terms of refreshing. It still works but won't rescan or update library and comes up with a subnet issue. I've tried removing my avast upgraded anti virus incase there was Java issue...to no avail. I've tried remapping and I've got to a point now where Minimserver will see the Qnap and refresh but has re-desgnated as Minimserver (mypc) rather than Qnap as server so it will only work now when the PC is on....and it sees the whole of my PC which I don't want...any ideas?