Missing values in dataset #614

Hi there,

I really like the Vital Recorder and I want to use it for research purposes.

One question: when I start the Vital Recorder and then try to open the signal in Python, I get the following graphs:

Also, in the data frame, some values are 'NaN' instead of PPG or ABP values.

Does anyone know if I am using the wrong setting? 

In some cases, the monitoring is however perfect:

I can't figure out when it works and when it doesn't. 

Kind regards,
Anna