HRM-Pro Plus Heart Rate drops

Hello,
Is it possible to change the frequency of the measurement?
I have a mild arrhythmia and whenever I do any activity that goes into zone 5, the belt is not able to measure correctly all the time. This is noticeable by the fact that the measured heart rate suddenly drops from around 180 to 50, stays there for a few minutes and then goes back to 180.
This is also very easy to see on Strava.
My guess is that my heart has so many extra beats that the chest strap gets confused.
Is it possible to change the measurement from 1x per second to 1x every 3 seconds, for example?