Gremlin

A gremlin was a fictional monster created by 20th century British Royal Air Force pilots to explain why their airplanes were malfunctioning.

In 2152, Captain Jonathan Archer blamed gremlins for a noise underneath the deck plating that wouldn't go away. Subcommander T'Pol was confused by the statement, but Archer explained. 

In 2376, Captain Kathryn Janeway suggested to Chief Engineer B'Elanna Torres that gremlins were the cause of several malfunctions aboard the USS Voyager. 

Similarly, Tom Paris commented "Who says gremlins in the engine are a myth?" after Fantome and his people shut down power on Valen and Bosaal's ships in 2377.