Matlab creates files permissionless files

I have a script in MATLAB that outputs various files, including NIFTI (MRI images) files and text log files. Sometimes the output files that are created have their file permissions set to no read or write for anyone, including the file owner, and this appears to occur randomly.

This normally isn't a problem unless it occurs with the logs, as it leads MATLAB to endlessly recurse as it tries to write the error to the logs. Unfortunately, I haven't been able to find anyone who has experienced similar behavior from any program, including MATLAB.

The script, input files, and output files are all located on a NAS drive connected to a server running Ubuntu 14.04, so I'm wondering if this is a problem with the script (probably not because it happens intermittently regardless of input), the matlab environment, or the NAS drive.