Good day, I too have been having files corrupted. In my case the files are from different jobs, different sizes. One thing I noticed in the "known issues" was that VW12.5 has a problem reading and writing to folders that have more than 31 characters. I changed my folder names. No help. I was autosaving to a backup and forgot to manually save when the autosaves occured (belt and suspenders approach) VW corrupted the backup file and left me with the drawing I had started with 3 hours earlier. Colleague suggested that the problem was 12.5.1 so I deleted VW 12.5.1 and re-installed 12.5.0. So far, no problems.
However, I know realize I deleted my precious Offset Duplicate command which I have been coveting since Nemetschek dispensed with this indispensible tool. If anyone remembers it, it was similar to the Autocad Copy command. Select an object, pick a start point , pick and end point and voila, a new copy appears at the end point. What could be simpler. Where is the equivalent in VW 12. I can't find it and it's driving me crazy, its' driving me nuts!