Well ... unless they were caused by stray transient electrical spikes changing the state of the system.  These <i>could</i> be a defect but it might also be caused by improper input signal conditioning (which would be a defect elsewhere in the system).  In either case, we&#x27;ve traditionally called these defects glitches and that lexicon has been broadened to more generally mean &quot;unintended behavior&quot;.