Reason Adobe LRC keeps losing the photos on my network drive? None had been renamed/moved.

Could be any number of causes.  Here are the most likely:

1. (Mac) you changed the name of the disk drive or volume where the images are stored
   (Win) Windows assigned a different drive letter to the disk where the images are stored
2. You did folder/file maintenance outside of LrC.  This includes moving folders, renaming folders or images
3. Your graphics card or its driver is acting up.  Try turning off GPU acceleration.  Make sure you have the most recent drivers from the card manufacturer (not just the generic one from Microsoft or Apple
4. There is a permissions problem in the fodler containing the catalog (on a Mac LrC must have “Full disk Access”)

In the Folders Panel do the folders have “?” on them?  

Unfortunately you haven't given us any detailed information about your issue and your system. Therefore, all proposed solutions are a look into the crystal ball.

Which type of network drive do you use and how is this drive connected?

Is the drive already with the same drive letter or name connected?

On which drive you’ve stored your catalog?

Which operating system do you use?

Your photos are showing the ‘Corrupted’ icon on all your files. (A black circle with !)

This commonly indicates a computer or hardware problem, possibly with the Network drive resulting in corrupted files. Files can be corrupted when importing because of card reader or cable problems,  or faulty drives, even RAM problems.