I have had mixed responses.
Somehave experienced the same thingas I have. We have the latest build code yet still crash after a "time-limit" has past.
Some have had similar, albeit less frequent, crashes related to earlier build codes issues. New build code fixed/mitgated the issue.
Some have not ever experienced these types of issues with 4 and thought I was, indeed, crazy.
It may just be some of us have the Perfect Storm of variables that gives us the joy of finding new and exciting ways to exit Pro/E.
Indeed...Save Often.