Can open .dwg in ACAD 2002 but not ACAD 2014 or 2015? Ideas?

Hello just a little quirk we have been experiencing here at the office. We have a main Microsoft Access database we work out of. This is how we navigate Clients/Drawings and open our drawings for updating. Anyways, from time to time when we go to open drawings it goes to open the drawing but then doesnt. Like a fast glitch. After trying to recover, insert, import, block, etc.. nothing works, however. When we go on our older conference room station, we are able to open these glitchy drawings no problems. From there we copy all and open and paste everything in a new template, save down, then proceed to open the standard way. Can someone please explain how this happens and why are we able to open these drawings through the very old 2002 and not the fresh new 2014/15?

I wish I could provide a drawing but they are sporadic and dont happen everyday. Any insight would help. Anybody else having this issue?

Maybe... the older versions are doing less error checking and allowing bad data to be read in?

Kind of like how IE will read a horribly coded HTML page, while FireFox and Chrome will choke on it.

BricsCAD and other clones will sometimes read DWG files that AutoCAD refuses to read also.

How are you closing the dwg's are you using the "X" top right this can leave .dwl1 .dwl2 which are file locks and could be part of the probelm.