Next time when you come across those pesky intermittent bugs try adding them to a wall or a board instead of logging them in JIRA. The wall can be next to your standup wall or a separate wall. The key is to choose a space that will catch your teams attention. This can help... notice a pattern with intermittent issues. You can then start grouping them under race conditions or corrupted data or specific state of the environment or performing tasks in a specific order, etc team is constantly aware of the random problems and so any related or similar issue found could help in investigating the root cause because the bugs are no longer hidden under a label in the bug database they have a higher probability of being fixed.