APC UPS XS 900 &MacPro shutting down too quickly?

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apologies in advance, as I'd bet this has been covered before - just couldn't find it with Search?
the problem is - in broad, general terms - I have an early 2008 8-core MacPro hooked up to an APC UPS XS 900 battery backup. The Mac Pro's a couple of years old, as is the APC.
Lately, when power goes down, the UPS battery kicks in just fine, giving me a few moments to save work, as hoped for. But when the power comes back on - and the UPS switches back from battery to line - the MacPro dies. The problem is that, if it's a really quick "power-off/power-on" (say, about 1 sec. or less), having the MacPro shutting down that quickly leaves no opportunity to save anything!
So just wondering if anyone else has encountered this type of problem, and suggestions?

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