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HRM-Pro Plus data gaps

I've noticed that when I'm running at faster paces there are frequently gaps in data from my HRM-Pro Plus during or around the faster paces. Take the activity below, for example. I was running at threshold pace during the highlighted period and there were plenty of gaps in respiration rate during and even after.

I'm wearing the HRM pretty tightly and I'm wetting it before the activity. Are there any other suggestions for reducing these gaps?