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My professional opion would have to be have a fixed wire test done, which incorporates all the breakers tested for performance and earth bonds etc.
Your plan of action sounds reasonable.
After reading through this, one of the posts suggested to me that the monitor can't handle the switch from mains to UPS power. There may be a few cycles of dropout that causes the monitor to reset.
If, that's hte case the solutions are:
1. replace the monitor
2. Replace the UPS to a constant on variety. i.e The devices always run on synthesized power
3. Try a constant voltage transformer. These device do change the waveform to somewhat of a square wave, but they generally will help with slight sags. They are large, ugly and EXPENSIVE. So ebay would be a good source. **broken link removed**
Sorry but all this sounds frightening to me.