We have a situation with a Revit job where the architects gave us two revit files, one is an existing conditions, and the other one is the new work. Everytime the job is opened from our electrical revit model it looses one of the links. We then have to "reload from" to attach it back. Then we can work normally. After we save the work we have done, and reopen it, the same thing happens...lost link. We have tried changing the link from relative to absolute, but it doesn't make any difference. It is just an irritant, but it doesn't limit us from doing our design work. Anyone had this happen before? Thanks.
I know this topic has come up before in here and possibly in the Revit Architecture forum as well. You can search these boards for similar topics. Below is the first related thread I found; see if it contains any useful information for you.
We ran into this problem before. The issue was that our Revit Drive on our server was set up with a different letter on each computer (an example, your "Local Disc" is typically "C:", some computers had the Revit drive as "K:", some as "R:"). If your Central file is on a network, each computer must see that drive as the same. Revit uses the Drive letter (not the name) to give the files a path.