File Manager size limits?

@gopher.ny I wrote a custom app that logs certain device events to a .csv file; the event handler does a straightforward append, using downloadHubFile() followed by uploadHubFile() with the new content. I added the singleThreaded: true flag to the app definition, but still seeing these errors from time to time (twice today) :

Any insight as to what could be the cause? I verified that there's only one app writing to this particular file.

In the meantime I'll see if I can catch the exception and add a retry mechanism to my app.

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