To me "glitch" implies a one-off transient error, which ironically is the original meaning of the word "bug" (an actual insect trapped and blocking a switch or

To me "glitch" implies a one-off transient error, which ironically is the original meaning of the word "bug" (an actual insect trapped and blocking a switch or electrical connection). Software people don't use glitch except for transient network issues or hardware reliability because software is deterministic. If it worked yesterday it will work the same way today, once you identify the actual bug-triggering conditions.