When running ModeShape at various times, I notice that during some hours in the evening (U.S. Eastern time) ModeShape5 will not start up. The issue appears to be coming from the updated logic in this commit:
https://github.com/ModeShape/modeshape/commit/bc574455aa7e0e7fa6f7a6e4820f5b777bfda3f1#diff-0bfcd93b5cc4efa01e1328b6fcb4c8c4L1987

..in JcrRepository.determineInitialDelay().

For example, with my local system clock set to EDT, running the following build command in the Modeshape codebase (73086b7289270827c2e5d95ddec8fc4107a8a3f1), produces the following results:
-----cmd
while true; do echo -n `date` >> compile.out; mvn clean test -s settings.xml -pl modeshape-jcr -Dtest=JcrRepositoryTest | grep "[INFO] BUILD" >> compile.out; sleep 1h; done

-----results
Wed May 18 15:21:31 EDT 2016[INFO] BUILD SUCCESS
Wed May 18 16:22:25 EDT 2016[INFO] BUILD SUCCESS
Wed May 18 17:23:14 EDT 2016[INFO] BUILD SUCCESS
Wed May 18 18:24:07 EDT 2016[INFO] BUILD SUCCESS
Wed May 18 19:25:01 EDT 2016[INFO] BUILD SUCCESS
Wed May 18 20:25:48 EDT 2016[INFO] BUILD FAILURE
Wed May 18 21:26:47 EDT 2016[INFO] BUILD FAILURE
Wed May 18 22:27:35 EDT 2016[INFO] BUILD FAILURE
Wed May 18 23:28:15 EDT 2016[INFO] BUILD FAILURE
Thu May 19 00:28:54 EDT 2016[INFO] BUILD SUCCESS
Thu May 19 01:29:41 EDT 2016[INFO] BUILD SUCCESS
Thu May 19 02:30:28 EDT 2016[INFO] BUILD SUCCESS
Thu May 19 03:31:13 EDT 2016[INFO] BUILD SUCCESS
Thu May 19 04:31:58 EDT 2016[INFO] BUILD SUCCESS
Thu May 19 05:32:44 EDT 2016[INFO] BUILD SUCCESS
Thu May 19 06:33:28 EDT 2016[INFO] BUILD SUCCESS
Thu May 19 07:34:15 EDT 2016[INFO] BUILD SUCCESS
Thu May 19 08:35:01 EDT 2016[INFO] BUILD SUCCESS

See attached build-error.txt for full build output of one failure run.

The following pull-request includes a unit test that demonstrates one error and includes a fix.
https://github.com/ModeShape/modeshape/pull/1561