My QNAP T219P II works fine when it's not plugged into any UPS.
When I plug in the USB from a UPS, the QNAP sees the UPS and everything looks normal, but after a few minutes, it shuts down then restarts.
The only entries in the logs are:
- System was not shut down properly last time.
- System started
(over and over again)
Initially I tested with my APC 750E and did the same, so I thought it was an incompatible UPS.
I checked the compatibility list that I received from QNAP and bought a compatible, Cyberpower CP600LCD
But I'm still having the same issue!
Might as well throw this thing in a garbage can, if I can't get any UPS to work with it....
(edit: I'm also on the latest fw as of today (5/2/12))