I was in coach D and for a while around midday we were down to emergency lighting and no power to the charging sockets, and no power to the buffet/kitchen cars, not good with two(?) coaches of dining passengers. An announcement was made stating that onboard technicians were working on the problem and after about 10-15 minutes it all came back on again. Probably unrelated but later on in the same coach they were having issues cancelling a continuously sounding alarm in the accessible toilet. Thankfully this was also rectified pretty quickly.