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There are several possible causes for psftp to fail with the error "local: unable to open" on a random basis:

1. Permissions: The file or directory you are attempting to access may not have the correct permissions set. Ensure that you have the necessary permissions to read or write to the file or directory.

2. File lock: The file you are attempting to access may have been locked by another process, preventing psftp from reading or writing to it. Ensure that no other process has locked the file.

3. File path length: The path to the file you are attempting to access may be too long. Shorten the file path by moving the file to a location with a shorter path.

4. Files with special characters: If the file name contains spaces, special characters, or non-ASCII characters, it could be causing the issue. Rename the file with a simple name to fix the problem.

5. Disk space: The error could occur due to insufficient disk space available on the system. You can free up space by deleting unwanted files, running disk cleanup, and uninstalling unnecessary programs.

6. Antivirus software: Occasionally, antivirus software can block the file from opening. Check if the antivirus software is causing the error and disable it temporarily to resolve the issue.

7. Corrupted files: If the files you are attempting to access are corrupted, this error message may appear. Check the files and attempt to open them using another application to determine if they have become corrupted.