search for: 4ups

Hi, all - I've searched the archives, and although I've come close to finding a few things that describe my problem, I haven't been able to nail it down. Basically I've got 8 TrippLite SU3000RTXR3U's (Couldn't it be a simple model number, like "4UPS"? hah!), and when I tap in to them with nutc, I see that the status flaps back and forth between OL and OB quite frequently, to the tune of several times a minute. I see that the power coming in is clean and not fluctuating at all, and none of my other UPSs do this, even those that nut is mo...