As a heads up, if your builds are stalling or unity is quitting without giving a crash report, during a build, Easy Save may be the culprit. You can confirm by going to your editor log and looking for Stack Overflow Exception: Es3ReferenceMgr...
This just started happening out of the blue on our builds last week.
Here is the temporary solution from Mookie
Easy Save Solution .
Please note that this is not an Easy Save error, but a bug that Unity hasn't fixed yet.