Current thoughput measurement in monitor is done as soon as there are a few batches ordered. It turned out that with large enough batches (and max batch size was significantly increased recently due to INDY-1334) this behavior makes it's possible to enter perptual view change (details are in INDY-1429).
Things to do:
1) Extract measurement code in monitor into unit testable class and cover it with enough tests, including ones showing problems with current throughput measurement
2) Implement windowed throughput measurements
3) Re-run load tests from INDY-1429 to see if problem is really gone