[Record] NaN output and too many line breaks in .txt file

What Happened?

The .txt file created by the record feature sometimes displays "NaN" for the timestamp, in both relative and absolute. It can also appear that there is a line break between the timestamp and the values or two lines breaks between lines.

Steps to reproduce

Operating System: Windows 10 Pro

Version : Ownplot 0.5.1

Chose .txt file extension as an output of the record feature. Start recording for a few seconds or minutes.

"NaN" and line breaks can randomly appear in the output file.

Screenshots

Line break between timestamp and values : image (1)

Line break between timestamp and values, and "NaN" : image (2)

Too many line breaks between recorded values (without timestamp) : image (3)

Priority/Severity

[ ] High (anything that impacts the normal user flow or blocks app usage)
[x] Medium (anything that negatively affects the user experience)
[ ] Low (anything else e.g., typos, missing icons, layout issues, etc.)

owntech-foundation / OwnPlot