My 2001 remapped vw golf gti randomly cut out all electrics and

[nickcarswell1]

displayed ecu errror code 18011? Car just stopped then when i attempted to restart the car it felt as if the battery had gone flat 30 minutes later it worked again as if nothing had happened error code 18011 is a ecu failiure i believe! Any idea if this would be a recurring issue or a one off? Thanks!