Good pickup that the OP may be using LT, Jeff.
yes I missed that possibility entirely, I've never used LT and have no idea how it functions.
I'm beginning to suspect his problem is not AutoCAD, but the system he is using to access the file on his network.
As an alternative (until a 'real' solution is obtained) would be redirect the AUTOSAVE to a local directory (Setvar SAVEFILEPATH) and change the SAVETIME setvar to 5 or 10 minutes. That way you can never lose more than 5 or 10 minutes worth of work.