[Python] np.savetext()/pd.to_csv freezes virtual machine

I am using VS Code running a python script that is processing some data and saving it to a .csv-file. OS: Ubuntu 22.04.4 LTS, running in VMware Workstation 16 Player (Host: Win 10). Unfortunately, on some saves it deadlocks my virtual machine. When I go to the details window in Windows Task Manager, it says the process is in a deadlock and shows me two threads of the VM waiting for each other.

csvDF = csvDF[csvDF.index < i + 1]
cutAt = path.find("temperatures_matched")
path = path[:cutAt] + path2TestCSV
#csvDF.to_csv(path, index = False)
np.savetxt(path, csvDF, fmt = '%s', delimiter= ',', header="minTemp,maxTemp,mean,matchedThermalArray")
#time.sleep(0.5)
#csvDF = pd.DataFrame(array, columns = csvColumns)


I already tested a delay after saving and switching from pd's to_csv() to np's savetext(), unfortunately without success.

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