Qnap time machine keeps disappearing

I'm new to Macs since January and we got a new Window 7 PC at the same time, along with a qnap, because it could do Time Machine backups.
I've had the same problem as many people since I got the kit - i.e. Time Machine insisting I need to make a new backup, which I've always done, though it was annoyingly frequent.  Anyhow, that's not the real issue.
For the third time since January, the whole Time Machine set-up has just disappeared from my Macbook Air.  Only this time I can't get it back.  It can't see it in my Finder, but I can find it under servers, in Recent Items.  Last week I was able to connect to it by this means, though not reinstate backups.  Now, when I try to connect is says it is unavailable.  We've not changed anything and as I am the sole user of Mac in our household, the Mac is getting the blame!
Sadly the demarcation lines extend to the QNAP, which is NOT mine, and unless I can find the cause of the problem and provide the fix, I'm not going to get any support.  I've googled the issue extensively and passed on the results to the QNAP owner, but we've not been able to fix it and I've had no backup for over a month. 
Aside from asking for a Time Capsule for Christmas, and doing my own thing, does anyone have any suggestions, or similar experience, or even know of a good resource for QNAP problems?

The device is either misconfigured or is unsuitable for use with Time Machine. I suggest you stop using it and back up to a locally attached external hard drive. If you don't want to do that, stop using Time Machine and use some other backup software. I don't have a specific recommendation.

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