GPhoto keep randomly removing filename entry from setting file

We have been using Photo successfully for a while to control some Nikon
D7200 cameras. We have recently upgraded the functionality of two of our
stations and started receiving a weird symptom. For some reason the
*filename* entry keeps getting removed from our gphoto settings file. It
will work fine for a few hours and then all of a sudden we start getting a
log entry saying *'Could not claim the USB device'* Given all the standard
causes for this error aren't valid we dug further and found that our
settings file had been changed. For some reason the *filename* entry which
had been there is now missing.

I know the setting file can get edited to update camera and USB port
details, but have no ideas why the *filename* entry is being removed. I
have the good version of the setting file included below ( actual filename
modified to remove client name). We have filename as the last line, is
there maybe some positional requirement I missed?

Thanks for your help,
Paul

cat /root/.gphoto/settings

gphoto2=model=Nikon DSC D7200
> gphoto2=port=usb:001,004
> libgphoto=cached-images=2
>
> gphoto2=filename=/home/pi/Desktop/name-client/client/img/fileprefix-20%y_%m_%d-T%02n_%H_%M_%S.%C


Config

This version of gphoto2 is using the following software versions and
> options:
> gphoto2         2.5.15         gcc, popt(m), exif, no cdk, no aa, no jpeg,
> readline
> libgphoto2      2.5.15         all camlibs, gcc, ltdl, EXIF
> libgphoto2_port 0.12.0         iolibs: disk ptpip serial usb1
> usbdiskdirect usbscsi, gcc, ltdl, USB, serial without locking


We are running under Rasperian on a Pi 3B

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