Datafields in the downloaded datafile

I download the data of my solar power system from the vrm portal on a weekly basis and import this data into an SQL database. I use the .cvs file. For some time, the number of fields in the datafile change, while the system configuration does not change. This upsets the import process, I have to correct the import routine (nearly) every time.

Is the issue known?

Is there a way to have the same data file format every time?