If Sumatra crashes or hangs reliably on your machine but we can't reproduce it ourselves, you can help us by debugging it. Here's a tutorial on how to do it.
Please first test with latest pre-release version from https://www.sumatrapdfreader.org/prerelease.html
Some bugs might already be fixed there compared to latest
Those instructions require SumatraPDF 3.2 or later.
Download symbols. Symbols are important for the debugger (like WinDBG) to resolve addresses to names that
%ProgramFiles% means the standard directory where Windows installs programs. It's
c:\\Program Files on 32-bit Windows and
c:\\Program Files (x86) on 64-bit Windows.
To debug crashes:
!analyze -vand paste the result of that to the bug report
Here are the steps to follow if Sumatra hangs