On 21st January 2018, the EIS instrument on the Hinode spacecraft unexpectedly switched off. Since then we explored possible causes, and also any risks to the other instruments if EIS was turned back on. We concluded that the most likely cause was a single event upset in the current limiter. During the week of the 21st May we slowly turned the instrument back on, and all is nominal. The EIS instrument is back in science observing mode.