Mapped Drive to Conf file

I am reading txt files from the drive that is mapped to the gateway server using Config file. We stopped the server and started because of the maintenance.
Now, it shows that the drive is not mapped anymore. Since, it’s a production environment, I can’t stop and start the gateway to map the drive again so I tried mapping a drive manually to the server but that doesn’t seem to work either.
The questions are -

  1. Why would drive will be unmapped on shutdown when I am not doing something like -

  1. How do I make sure the drive get’s mapped every time the gateway is started

  2. Is there a way to map a drive without stopping and starting the service again ?