Garmin FR 265 HRV measurememt

I have been regularly wearing my FR 265 for about a year and monitoring my data. My HRV measurement usually varies between 25 and 30. For the last 5 days, however, the measurement has been over 60. And the graph for the overnight values is not a continious line (as it has been before) but a series of discontinious readings. There has been no significant change in my lifestyle or excercise progam to trigger such a massive change.

Do you think this is a problem with the software update? Is there any way to fix it?

This is importantn because the HRV value is used to calculate training readiness etc. So, when the HRV measurement is wildly off, it skews all the other metrics as well.