malfunction
mal- + function
https://gyazo.com/765ae0e855f8ed422630746a06aaac78
source: Wardrobe malfunction. - Album on Imgur
verb no object
(of a piece of equipment or machinery) fail to function normally or satisfactorily:
｟かたく｠ 〈体･機械･コンピュータなどが〉うまく機能しない
e.g. the unit is clearly malfunctioning.
noun
a failure to function in a normal or satisfactory manner:
｟かたく｠ (体･機械･コンピュータなどの)不具合, 機能不全; 故障
e.g. a computer malfunction
e.g. mass noun : they were sent back to the manufacturers at the first sign of malfunction.