I too have been using ProSeries for 15+ years - just trying to help with what I would look for if I was having same issue as you.   Are you printing to a wireless printer ?  Bad signal to printer causing date to be lost?   Is it an older printer that needs the driver updated ?         

 I had some quirky issue with my printer a few weeks ago where every page too a painstaking minute to spit out.  I am positive this software caused it.  I had to reset printer to factory default to get it working right.