If they haven't done already your VAR can ask Solidworks to look at the performance feedback reports from the offending manchines to see if there is a pattern. This is presuming under Tools -> Options -> General -> “Help make SolidWorks products better by automatically sending your log files to DS SolidWorks Corporation”.
No guarantees there will be something useful in the logs but i have had sucess in the past. Also even an rx after the crash can contain some useful info (just don't record a video, package the files instead) at worst it would give your VAR/SOLIDWORKS the windows logs which can be useful.
You are probably on the right track when you say it is some interaction with windows, 6 years working in SOLIDWORKS support has taught me it's often a windows prerquisite such as .Net framework, c++ etc. Your VAR/ SW Support should be able to reccomend what to try next though .
Given that a common failure is on check in/out, I would be suspicious of your network.
Yes, good point.
We have 100Mb & 1 Gb, so todays task is to map the various failures to their respective networks and see what the data tells me. I love it!
Short term plan is to get all designers on 1Gb of course. I cannot believe that hasn't happened before (I'm new here)....It will happen now.