UPDATE: Solution to the Sprint Galaxy S6 crashing issue.
We believe we've found the solution to the Sprint Galaxy S6 crashing issue.
It's related to a software update that that was rolled out for Sprint S6 users. On August 24th, version "G925PVPU2BOH1" was released. If you have this latest version, Word Streak should be working perfectly for you!
You can check your version by going on your phone, clicking Menu --> Settings --> About Device and it should be the code under Baseband/Software Version.
You can take a look here
for more information.