After starting up my PC I get an error when trying to attach a VHD located on my NAS. The error states another process is using the file. To fix the problem I copied a random file from my PC to my NAS and I was then able to attach the VHD. I believe this somehow gets the "connection working" between my PC and NAS.
I would like to fix this issue so I don't need to copy a file every time I want to attach a VHD after rebooting my PC.