Thank you very much for your reply. I will try to save in another directory, but it seems strange to me because until a few weeks ago, as I told you, I had not had any similar problem.
I changed the root of the save directory to DCIM and it started exporting without any problems, problem solved for now. I just have to be careful now not to exceed the size of the resulting files and the amount I store because I think the device only has 5 GB free.
Thanks for everything. I think you do an excellent job.